Side by Side Comparison of: 3M vs Evoluent vs Posturite vs YUMQUA

I have used these mice for about 10 years. This is the only way I can use a mouse for more than an hour without a lot of pain.The only negative is reliability. I have a very old grey buttoned version that is still going (except right click is flaky). The newer versions I have bought (black button) have not lasted as long. Even considering the reliability issues, these mice are excellent in my opinion.To clarify what some people have asked in the comments - the grey buttoned versions are older and have a lower DPI (but seem really reliable). The newer version has a black button and higher DPI (but may not be as reliable). Amazon's pictures show both the old (grey) and new (black) versions. If you are wondering if Amazon will ship you a old or a new the answer is new (black button). The change came about 5 years ago so the old grey ones would not exist in new form from any supplier at this point.

I started using this mouse several years ago because I was having carpal tunnel type pain in my arm and wrist. The pain went away after a few weeks, and has not returned. Getting used to this mouse was easy; in fact, I don't even think about it anymore, and wonder why the IT guys stop before working at my computer. There are some products which just work. This is one of them.

I was having hand pains from using a mouse, and had previously been using a different erg mouse that was shaped like a regular mouse except rotated so that your thumb was facing up. Anyway, my friend was using a joystick mouse and raved about it so I thought I'd try it out.I was shocked to see that a lot of joystick mouses were $100+! But also glad to find this 3M one that was significantly lower priced. I purchased it and was glad I did. It initially takes a little time to get use to using and you may get a few inquiries from your co-workers, but the grip is significantly easier on your hand and since I've been using this mouse I do not get any hand pains.I have had this mouse for about 6 months now and have not had any issues with it. (which I cannot say the same about the prior erg mouse I bought, which I had to replace after a few months).If you're worried that the shape is a little strange, once you get use to it it feels a lot more natural than a standard mouse. Yes, it costs a little more than a standard mouse, but it is totally worth it. The only downside is that the scoll feature is a little finicky. Whereas in a standard mouse you can roll the wheel at the speed you want and stop it at precisely where you want, for this mouse you squeeze the "trigger" button and drag up and down. You can scroll faster or slower this way, but it's not as precise as a wheel.

I purchased this device - the large version - after flight-testing the small version. The latter had been given to me by my company ergo-expert to alleviate discomfort in my hand from mousing. I like the joystick design.The small version was just that: too small for my hand. The large version is ideal for me and the discomfort I was experiencing went away.One downside tot he device is that it does not have a scroll wheel. For me, this was not an issue, I simply use the page up/down keys on my keyboard. It works for me and allows me to move and grip differently. At the same time, I can see how some might find the absence of the scroll wheel annoying.

I bought one of these suckers back in 2012. It still works. I haven't had any abnormal double-click issues (unlike some other mice I've bought). To be fair, I use this mouse on and off over the course of a day, and some days don't touch it.The 3M ergo mouse doesn't take too long to get used to it and get to be adequately accurate. I've found, however, that even after all this time I'm still a little bit less precise with this compared to a "normal" mouse, and considering the speed at which I work this can annoy me. If I'm working with mouse-heavy applications that require precision (in my case, UE4's node-based scripting, or working on GUIs, or playing games for completely professional reasons), I switch to my 'normal' mouse. I also continue to use a 'normal' mouse at home. Still, this is great for most of my work. If I'm just clicking around an IDE or checking emails or whatnot it's perfectly adequate and comfortable.Previous to this I owned an Evoluent VerticalMouse. This is much more comfortable for extended periods of time that that mouse. I think it might be that it's less severely vertical, or perhaps that you can curl your fingers around it, but I experience no fatigue at all with this, while the VerticalMouse was only a minor improvement over a normal horizontal mouse.

Back in the 90's when I first got a computer I quickly developed carpal tunnel syndrome, after trying wrist supports I looked for a different type of mouse. I came upon the Anir ergonomic mouse, this was the original design before 3M acquired them. It had the rollerball and needed periodic cleaning. Touch time to adapt to movement of the cursor, not as precise as regular mouse, because its all arm and shoulder controlled. But the wrist pain was eliminated so I could spend long hours now on the computer. When i do on occasion use a regular mouse it doesn't take long before the old misery returns. I WILL NEVER GO BACK. When 3M came out with the EM500GPL optical version I got it and love it- no more cleaning out the gunk. I've had this one for +10 years of carefree use. When I switched to an iMac recently I hoped that it would work with it. It does but without the scroll feature. Too bad but having no pain is really the priority. The reason I am writing a review now is because I looked at the wireless model and was considering it but the reviews on it showed issues-mainly buttons stop working. Also it isn't bluetooth or laser so it must be old and not updated with the newer technologies- so I pass and will stick with what works. If 3M decides to come out a wireless bluetooth model I'd be interested then.

If you have any issues with your wrist or arm,this is the mouse for you! I started using it when with my stand up desk, but now I use it all the time, sitting or standing. Its great. Takes a bit to get used to, but I wouldn't do without it!

It takes about 1-2 weeks to get used to but after that it's the best feel on your hand. It uses the shoulder and some wrist extension and flexion (rather than side-to-side) movement to operate. I would recommend this to people who have a problem using the index and middle fingers on a standard mouse since most of the action on this mouse comes from the thumb, shoulder and wrist.

Without a definitive guide to selecting the correct size the FIRST time, you're likely going to have to take the Goldilocks approach to discovering which device fits best - unless you know you have small or very large hands.
I made the mistake of allowing one reviewer's opinion guide me to the wrong size: "...unless you have gorilla-sized hands, you should choose the small model."
Learn from my mistake...
The width across my fingers, where I grip the joystick, is around 3.75" - which happens to be 1/4 finger-width too large for the small model, and about 1/4 finger-width to small for the large model. In other words, 3.75 is about a tween size for these two models.
At 3.75" - I'm much better off with the large model:
I stack my pinkie, ring and index fingers on the base - allow a slight bit of space between my index and fore fingers - and support my thumb on the top of the joystick stem.

I built a house on my own and used a good 'ole hammer to drive every nail (not recommended). When I got done, I could not feel my fingers, especially at the tips other than occasional stinging and a constant tingling and ache. My job required me to use a mouse all day long and the pain just got worse. Not liking surgery or the fact that the pain often returns after surgery, I got the taller corded version of this mouse. Not long after I trained myself to hold it properly, I have been symptom free for over a decade of continuous use. To show that it was the mouse that eliminated the symptoms, even now, if I have to use someone's traditional mouse, my hand will start to ache in minutes. I can now pound some nails occasionally without a problem.

The key to this mouse is that your hand is in a very natural position when using it. People scowl when they look at it until you ask them to stick their hand out in the most comfortable position (kind of like gripping a hammer in front of you). The left and right pick buttons require a small and slight roll of the thumb and the switch is at the first knuckle, not the tip of the thumb. The middle mouse button is on the front side of the stalk and requires a slight squeeze with a couple fingers again at the first knuckle. The buttons are not overly sensitive yet do not require nearly as much pressure and it is not applied at your finger tips.

Recently, I bought this small wireless version and am even more pleased. I can't imagine anyone having hands large enough to really fit the taller one.

Finally after numerous tries of other ergonomic mice - found a type, vertical, that doesn't make my arthritic right hand and fingers painful and more sore.

Not absolutely sure it is this product or the design in general that helped. If cost wasn't a factor, I'd like to try several different manufactures vertical type mice for comparison but I can't afford to do tests on all if I have to buy them to try. This one will do for the time.

I would recommend this for anyone with arthritis. You don't have to twist (supinate) your wrist to make it work. That reduces the repetitive motion stress that conventional mice cause to the tendons and ligaments of your fingers and wrists. Its not perfect, but its good. My index and 2nd finger, the ones with the worst arthritis, aren't actually painful when I'm using it. They still will get stiff after prolonged use though. Just need to do a fit of flex/extension to them and I can continue moussing around longer.
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It might take a bit of time to get use to using your thumb as the clicking finger but I found that some of the arcade type games I sometimes play are easier to do with this mouse. Not as good as one designed for gaming, but better than either a standard one or a tracker ball type which remains stationary and you use your thumb for directional movement.

If you have functional problems with your hands or fingers, this may be the mouse for you. I have both. I have had this mouse several days now, and it's been such a help. "Clicking" is a particular problem for me, and this mouse has reduced the need to click by about 75%. I set the mouse to click for me if I hover over a click spot. Also I was able to adjust how long the mouse needed to hover before the auto click function engaged, which I really need, as I have to have more time to get the cursor or arrow were I really want it to be. There are a lot of different things you can set the mouse to do for you, but I am not great with computers so there was some more complicated settings I don't feel comfortable doing. But the auto click, and the ability to move the cursor when typing by just hovering, is huge for me. I also set the "scroll" on the wheel to a faster pace so I have to move the wheel less. Also you can easily use different fingers when you do have to click, like your middle or ring finger, very helpful to me.If you understand programming better, I think there's a lot more you can do. This mouse is going to help me keep working, as my job requires a lot of computer work. I will be getting one for home as well. Size wise, I got the regular, I am not a large person, and the size fit fine. Thank-you to Evoluent for thinking about those of us with disabilities.

I've owned three generations of the VerticalMouse and they keep getting better. I have the original which I still use at home and a VerticalMouse 3 that I used at work. I've just purchased the 4 to replace the one I use at home, but not because it's worn out. They make these things to last forever, so it's still going strong, but the new one has a more contoured shaped that makes it even nicer to use.A while back I started to experience some significant carpal tunnel symptoms and having known others who had this, I decided to do everything I could to prevent it. After quite a bit of looking an testing out the various theories, I decided on the Evoluent for a mouse and the Microsoft Natural Ergonomic Keyboard 4000. It only took a short time for all of the symptoms to vanish. There was a bit of a learning curve where it didn't feel right, but it was worth it. It was either 'go ergo' or get a different job where I wasn't in front of computers all day.I've tried other ergonomic mice and been very disappointed, but I haven't tried many. This is because, when I bought my first one, they really had no competition and now, although I'm curious, they last so long that it doesn't seem reasonable to keep adding to the litter of mice on my shelf that I will never use.

I have been using this product for just about 1 year. I have had severe pain in the little finger of my right hand which also became cold to the touch - both of which I found was due to tapping the ENTER key on the numpad 10's of thousands of times over the years. I switched to this pointing device hoping it would relieve some of the pain as heavy computing is how I earn my paycheck. I am very pleased with this product as it has definitely reduced the pain in my hand and it also "fits" my hand... regular mice are too small and don't conform to ones hand properly causing the hand to curl entirely too much.I am even more pleased with the product since I've had a double click issue when single clicking which had been worsening over the past 2 months. I contacted Evoluent via email and a prompt email response from Evoluent technical representatives directed me to send in the unit and another prompt email was returned after they received the unit stating that unfortunately, they were not able to duplicate my concern, however they were sending a new replacement unit in its place. Wow. I did not expect that. At the very least, I expected to pay for a repair to replace a micro switch for the main left click. At most I expected to pay for a replacement unit.Excellent customer service and turnaround of about 1.5 weeks due to being located in the middle of the Pacific Ocean so shipping takes a bit longer.I've been using the replacement device for my normal heavy computing usage and have not had the double click issue.Thank you Evoluent for an outstanding experience. I've recommended the Evoluent product to my colleagues. I will purchase a wireless unit in the future.

I'll be comparing three mouses and there differences but first a short background for my reasons of needing an ergonomic mouse as we all have different reasons. I'm a gamer from way back in which to my knowledge caused to to gain carpal tunnel syndrome in which I had surgery over a decade ago actually I had it in both hands and both were operated on, years after the surgery, I still to this day have pain and discomfort when using a mouse. Lets start with the first mouse.I first purchased the Anker 2.4G Wireless Vertical Ergonomic Optical Mouse, July of 2014 in which alleviated or helped with the pain but still have some discomfort even though it positions your hand in an somewhat vertical position, it did OK but still left me in a bit of pain after long periods of use.I had just two weeks ago before Christmas bought and tried the Posturite Wireless Penguin Mouse though it positioned your hand in the correct position full vertical it was very cumbersome to maneuver the pointer, awkward as since your palm rest on the mouse it leaves you using you to use your whole fore arm to maneuver the mouse not near as accurate and precise as the Anker so I had no choice but to return it.I just purchased this Evoluent mouse and I have nothing but all positive to say about this mouse, hand position is the up right correct vertical position same as the Posturite mouse and more so than the the Anker mouse, maneuvering the pointer is spot on accurate, hand comfort with no pain and many more mouse buttons to offer so out of this group of 3 mouses the Evoluent is by far the top of them all in all areas.Edit In; 12/30/15I'd like to let known that I found the scroll wheel not working properly it would jump around in some applications not allowing the page to scroll, I contacted the manufacture and was instructed to uncheck accelerated scrolling box inside under the wheel tab in the mouse software for the mouse, by doing this resolved the problem with the scroll wheel not working.

This is an evolutionary improvement over the Evoluent 3, which I used happily for several years [since Jan 2010] before the mouse wheel began to have intermittent failure to register movements. I find the changes made in shape not too problematic to adjust too, though I prefer to keep contact with the mouse pad using my smallest finger so the "shelf" to support it is unappreciated by me. Fine movements of the mouse are easier for me with that contact maintained. The additional button on the thumb side is appreciated.The software that can be downloaded to manage the mouse appears to work fine, though I miss the choice of "aero-mode" document flipping that I used to have available [maybe that is a Win 7 operating system issue, I'm not sure], Also, the middle mouse button appears to be recognized differently by my game software, I don't understand why : I had to assign MB6 to it's function in Elder Scrolls Online. I had no such problems with mouse button recognition using the Logitech G5 (my previous and still back-up mouse)I originally purchased this mouse to relieve repetitive motion pain symptoms in the right wrist when using the computer for extended periods of time. It completely resolved the pains. After using a regular mouse for several days when the mouse wheel began to malfunction, I could feel the wrist symptoms returning. As of now the symptoms have again resolved, and did so immediately when switching back to the Evoluent VerticalMouse 4.I should mention that the switches used on the mouse are responsive and seem to work a little better with the upgraded device. I actually use the mouse for gaming, these things are important to me. An all-in-all sound investment, one I would be in real trouble without having made. I have never tried other brands of "vertical" mouse products, and the reviews of them don't encourage me too change. This was my first and remains my only choice for ergonomic computer mouse.

If you are a graphic designer, just stop reading and buy this mouse. The idea behind it is brilliant and since you are a designer, you hugely appreciate brilliance when you experience it. After a short while, your wrist, elbow, and sometimes shoulder pain will be gone, as will the hideous browsing-bump on the heel of your hand that grows in direct proportion to your mouse-time.Believe it or not, the evoluent software is actually great. I thought the idea of an automated alarm telling you to stretch for 1 minute and then telling you to get back to work would drive me crazy, but the opposite is true. I stretch and then drop down and rap out 25 push-ups and it's better than a cup of coffee.A couple musings:You WILL get told by people who see it (guys) and try it out that it feels like holding a hard-plastic breast. It will then be impossible to remove this analogy from your thought processes.If you run Windows 7, do not EVER customize your taskbar setting to hide the icon for the evoluent software. I made this mistake and there is no correcting it without a clean install of Windows 7. A registry bug that is virtually unfindable results from doing this, and no amount of uninstall and reinstall will correct it.There is an awesome button you will love that allows you to switch to an excruciatingly precise cursor speed, which is greatly helpful in the design world.Two enthusiastic thumbs up.

Great mouse! I used to own the Evoluent mouse before I purchased this one and I find this one very easy to use and I experience no discomfort with it. I recommend it.

Mouse elbow and tennis elbow damage the exact same tendon. My traditional Mouse was causing pain in my elbow and playing tennis just made it worse.after using this product for 3 months I have zero pain when I use the computer or when I play tennis.

This mouse has helped tremendously in alleviating my wrist pain. Takes a little time to get used to it, but once it 'clicks' (pun intended), it's awesome. I'm right-handed and love switching to my left hand for certain tasks, which has improved its strength and dexterity. I've had the wireless version of this mouse as well, but I prefer the wired version so I don't have to constantly recharge it. It doesn't take up any more room than a normal mouse either.

I've been using a computer/mouse for over 30 years and have found this to be the most comfortable mouse for my hand. It also is versatile to use with the left or right hand, the small switch on the front allows you to reverse the direction of the mouse to accommodate left or right handedness.

This has been the smartest purchase I have made in a long time! I have tried another ergonomics Mouse and also the Evoluent. This Penguin is by far the best! The Evoluent mouse, my bone on my wrist would get sore, the Penguin - my wrist bone doesn't touch the desk. I was in so much pain - now I can work - switch hands when I want to - and not have the pain any longer. The pain I experienced was in the hand, not the wrist. I would recommend this to anyone that has any issues with the mouse. I relied on the reviews to buy this mouse.

I researched a number of vertical mice and decided to try the Penguin primarily due to the ambidextrous capability. I am right handed, but am able to use a left handed mouse. It's nice to switch back and forth every 6 months or so to rest the working arm.It fit perfectly out of the box and I adapted within the first day. Very comfortable, easy to use, sleek design, easy to set up, and affordable. I highly recommend the Penguin!! It exceeded my expectations in every way. It feels so natural in your hand. No awkward turning of the arm or wrist and no strain whatsoever, even after hours of use. Kudos to the designer!!

I suffer from chronic wrist pain and tennis elbow and by using this ergonomic mouse I have reduced the amount of pain I feel. I do a lot of photo editing and online work but due to my chronic pain, I am unable to use the mousepad. My physical therapist recommended this mouse. While it has eliminated most of my pain, I have noticed that other areas are starting to hurt a bit when I spend many hours working. No fault of the mouse, it is just overuse of my fingers and arm. All in all I would recommend this mouse if you have any chronic issues.

Works great, relieved strain in one part of my forearm from index-clicking. Ended up causing strain in my thumb tendons and extensor carpi ulnaris tendon though.

I ordered this Feb 16th and received it on Feb 17th- with my prime 2 day free shipping (magic!). Here's my review right out of the box:1. I got the small size. My hand width is between 3.0 in and 3.5 in, and the small feels fine to me.2. I understand that some reviewers might think it's clunky and doesn't track that nicely. No, it does not function as smoothly and you can't operate it as effortlessly as a regular old mouse clicker. However, I did not buy this ergonomic mouse to act just like a regular mouse. I bought it so that I could avoid the excruciating, shooting, unbearable pain in my index finger. And guess what? This ergonomic mouse is perfect for that! One day I'm trying to pull my finger off to make it stop hurting so bad, the next day the pain is gone and I'm using my ergonomic mouse. Yay!I'll update my review if this ergonomic mouse goes kaput or something like that.

*Edit: This mouse is awful if you're a computer programmer. - SO I use two mice.. One for general usage; emails, meetings, browsing, researching, and another mouse for programming..*Great mouse, but the mouse is sadly way too small. Their "large" would fit like a US Medium sized t shirt. I guess they thought that people will actually 'large' hands will not be using this mouse. I'm 6'0, 175 pounds, medium build, but I can only put four fingers on the dang mouse. My pink is flailing around at the bottom to allow my four other fingers to fit comfortably.Either way, the pressure alleviated from my wrist is quite worth it.I highly recommend this mouse given that your a fairly small person with smaller hands.A Large would seem to fit a person .. maybe 120-160 pounds, andA small would seem appropriate for a person that is under 120 pounds

I purchased this erg-mouse to relieve finger pain and stiffness from 30 years of mouse clicking. After a day of (standard) mouse clicking, the joints at the middle two fingers on my right hand would freeze up during the night. It required using my left hand to work them lose every morning. Now that I have been using this ergo-mouse for about a week, the morning stiffness has noticeably decreased.Holding and gripping a joystick takes some getting used to after so many years of simply pushing a mouse around on the desktop, particularly when 'fine tuning' the pointer position during CAD (computer aided design) work.The only downside so far: because the joystick design keeps your hand in an upright position, the height of the work surface comes into play. Just be sure you can position this mouse at a comfortable height. Otherwise you might find yourself holding your hand in an awkward position to use this product.

I'm a designer + a gamer so I'm on the computer anywhere from 8 to 16 hours a day. I'm also only 28 - but started getting pretty bad pain in my right arm from using the mouse. It wasn't as bad as some of the reviewers here, but it became harder and harder for me to focus and get work done with the constant aching in my forearm. I was doing carpal tunnel exercises [...] to help with the pain, but it dawned on me that I probably couldn't keep this up for another 30 years using the same methods. So, I purchased this mouse.A few things after a few months of use:Pros:I've been using a computer since I was 9, but this product came naturally for me. It felt good.Pain is reduced. It's not gone, and hurts in a different way, but it doesn't stick around with you after you leave the computer. Often feels like a sore muscle. It's way less painful than using a mouse.*Cons:For gaming, you have to set the middle button to do what you want - most games don't really recognize it, but it's a mild inconvenience.Scrolling is different and takes some time getting used to.It's not as precise, but i think playing with the sensitivity and speed will help you out.*I feel like my setup isn't quite right. I'm not entirely sure where/how to rest my elbow and it can sometimes get a little awkward. I am going to try pushing keyboard mouse away from me so my elbow is forced to rest on the desk and now the elbow of my chair for more flexibility.

I was debating whether to buy small or large (I am sure you are too if you are reading this)
Lots of reviews mentioned that reviewers' hands are large, and smaller version works fine.

Stupid me.
Let's face it: how many men do you know who would say/admit that they have small hands?
(I think someone even mentioned gorilla hands for large one)

It felt great when I first wrapped my hands, but when I moved the mouse around, I had to stack my fingers tightly.
(Because of this, it's more comfortable when I don't use my pinkie to wrap around)
I am in military, and I have been issued tons of gears from head to toe: medium fits me most of time including gloves.

I have one thing to say for those who mentioned that smaller version fits just fine when their hands are supposed to be large:
"Hey, homie. Face it. You have baby hands."

I bought this because I have had major wrist pain for 18 years. I've had carpal tunnel surgery in both wrists, with a follow up surgery on my right wrist, and still had pain using a conventional mouse. Let me say that this mouse took the pain away almost immediately! It caused a little bit of pain in other parts of my hand because you are using different muscles to use it, but it wasn't bad and went away in a few days. I can use this mouse every day and have ZERO pain now in my wrist. Based on that alone, I would give it 5 stars. However, it loses points for functionality and precision. I work for a law firm and do a lot of precision work including filling in forms in Word documents that require a lot of selecting, copying, and pasting. I used to be extremely FAST, but I feel like this mouse has slowed me down by about 25% (maybe more). Based on functionality, I would probably give it 2.5 stars. It does not have a scroll wheel, which drives me crazy (although there is a way to "scroll" - just not what I'm used to). But I guess it's a trade off for having absolutely no pain. And based on that, I am giving it 4 stars. If you have had CTS wrist problems like me, where nothing else has worked including surgeries, I would recommend this mouse. If you have no problem using a regular mouse and do a lot of precision work, then by all means go with a regular mouse. I am still on the hunt for an ergonomic mouse that is both precise AND pain-free, and have tried several, but I can't seem to find the perfect one. So far this has been the best pain reliever for me.

Quickly eliminated wrist fatigue. Quality look and feel. The shape of it requires a little self-retraining, but everything functions well and as intended.

The only thing I hadn't considered was the lack of a scroll wheel. A 3rd button has been added on the shaft of the joystick itself that can invoke an auto-scroll mode (like clicking down the scroll wheel on most mice). This generally works well, but may often activate different results in different applications. The only tricky thing I've had to work around is CRTL+Mouse Wheel zooming in/out, but that wasn't a big deal.

All in all I'm very happy. I use this at work designing graphical items and find the precision to be right on point. The auto-scrolling is actually quite nice when scrolling around a large image or document. I'll often find myself activating autoscroll with it, then moving the mouse down just slightly to create a constant smooth scroll -- very nice for reading lengthy pages/documents (or something as simple as quickly scrolling a social media feed).

I bought this mouse in Like New "used" condition from Amazon Warehouse for about half price. I actually like it better than I thought I would, at least as an intermittent break from using mice of other configurations (including even such ostensibly fully "ergo" designs as Microsoft's "Sculpt" and the LuguLake "vertical" mouse). Thus, if you can find a fine specimen at a reasonable price, this mouse makes sense for anybody seeking ergonomic wrist/hand/finger relief. I like how the pinky finger rests comfortably upon the mouse's base (instead of dragging across the tabletop as with the LuguLake "vertical" mouse).

Also note: I'm a six-foot-one male whose hand perfectly fits the typical "Large" glove, but this 3M mouse's "Small" version fits my hand perfectly, and so I'm glad I didn't order the "Large" version, which would've felt uncomfortably unwieldy to me. (That said, if my hand were any larger--or my thumb any lengthier--it'd be too large for this "Small" 3M mouse.)

Though this mouse's tracking and (especially) unconventional scrolling approach do take a bit of getting used to (and may never seem 100% as good as most other mice), its uniquely ergonomic shape provides my hand and wrist significant relief, and so I'd rate it a solid "four out of five stars."

Finally, don't fret excessively about the somewhat notorious "wireless-connectivity" nature of this mouse and its USB dongle. If you have the mouse already switched on while starting your PC, the mouse and dongle conveniently AUTOMATICALLY communicate. However, it's true that if you switch off the mouse or remove the dongle while using your PC, you'll either need to (somewhat tediously) press their respective "linking" buttons OR simply restart your PC to restore their functionality. Even so, it's well worth putting up with such minor, occasional inconvenience in order to enjoy the unique ergonomic benefits of this 3M mouse. [BTW, to avoid overusing/stressing your THUMB, I suggest that (every day) you sensibly ALTERNATE using this mouse with using some other type of (preferably "ergo") mouse that lets you left/right-click with one of your other fingers.]

I've been putting off this review for months because frankly, I'm lazy but there are so many products I buy on here based on helpful reviews I thought I'd give something back.

This is a great little mouse that will help you get past your RSI injuries and cramps. Personally, I never got carpel tunnel but my hands (I alternate between right and left) would get very very hot and cramped when using a regular mouse at work. They would get SO hot and cramped up that I'd have to hold ice in my hands towards the end of the work day as well as keep stretching out my hands, wrists and fingers. This mouse is not a heavenly solution because my hands sometimes get warm but I'm no longer suffering. In fact, most days are just fine even when I use the computer at home (different mouse) for hours after work.

Here's what work you need to put in:

--change the sensitivity or more like clicking speed for your right click on your PC. This is done under devices or control panel. I'm referring to the double click speed you need to open folders and programs--LOWER THIS. Why? See below.

--you will need to remap the mouse keys. It is set up to have the right click and left click done by your thumb. This tires out your thumb quickly, a few hours or a few days and you'll know what I mean. To remap, you download a very small, trustworthy program called autohotkeys. This program simply re-assigns the right click button to the biggest button on the mouse, the one meant for scrolling. This eliminates the thumb fatigue completely. Why wasn't the mouse already designed like this? Dont know!

Download the program here: [...] Choose "window's installer"

In case you are at work and don't want to install this on the crappy work computer, you can run the program off a flash drive. Yes, small and portable.

Now, when you first run the program, you'll get a little message saying "Here's a sample script" or something like so. Click ok and select ALL on that page (it will be on Notepad). Select All and paste this on there:

MButton::LButton ; Map center-click to left-click
LButton::MButton ; Map left-click to center-click

Save this and exit notepad! This code tells the program to re-map the keys like I mentioned. The right clicking will be done with your ring and middle finger or both if you'd like. You will scroll with the button designed to right click. Just try it and you'll see what I mean and how it makes this mouse so much better.

--Lastly, adjust the cursor speed if you'd like. The mouse responds a little quickly.

Now use it and use it. Your hand will get used to it. I actually use it with both hands. I'm good with both hands including sports, it helps a lot. Try it. It beats RSI. NOTE: YOU'LL NEED TO RUN AUTOHOTKEYS every time you use the mouse. If not the buttons act are at default and your thumb will start hurting. Its easy to run the program, just double click the autohotkey icon on your desktop or search for it.

You are welcome. I hope this works for you as good as it did for me :] Oh and the mouse feels nice and sturdy, solid build.

I've been having issues with both my wrist and elbow for the last few years - not all started from using a computer daily. However, they would become aggravated with continual computer use. At times, this would require minimizing and avoiding the mouse as much as possible - not a big positive when my work requires it. I had been doing much better until recently. Due to this, I began researching alternative's to the standard mouse. After reading all the reviews, I ordered the Evoluent VerticalMouse.I am happy to report that after months of use, the elbow issue has become almost non-existent. My wrist and hand issues have also become much better. However, while it has greatly improved the ulnar and median portions of my right wrist/hand, most of my issue has been at the base of the thumb (radial) and index finger back into the outside of the wrist. While the mouse does an excellent job maintain a better hand position for most issues related to pronation, it does still require a 'pincing' motion between the thumb and index finger. Again - it is a major improvement over other devices and has greatly increased my comfort; however, if this area is your primary problem, just recognize this mouse is not the panacea for all hand/wrist problems.I still recommend this mouse highly as it has been a major improvement for me. I would just recommend maintaining your expectations.

A good product, if expensive. It's a specialty product that's probably not produced in huge numbers like your typical $20 Logitech mouse, so it's got a higher price. The silver on the thumb rest feels like the plastic you find on cheap Chinese toys. Doesn't feel like it should cost $80 - $90 new, but that's the way of things. The Kinesis Advantage keyboard feels like a hollow bathtub toy and it's $250 - $300, but it's a similar niche product. The buttons and thumb rest attract skin grease like a magnet, so you'll probably want to scrub every once in a while.The software that comes with this is junk if you want to click and use the keyboard at the same time, at least under Windows 10. When I held down a key on the keyboard and tried to click on something, the click didn't go through. I first noticed it while trying to play a game, but it happens in productivity software too. I uninstalled the Evoluent software and switched to "X-Mouse Button Control" from highrez.co.uk to re-assign my buttons and never had that problem again.A useful tip to turn off that obnoxious light on the back: make sure the computer is on, unplug the mouse, hold down the pointer speed "-" button on the side of the mouse and plug it in. No more light. It still shows the little green lights on the top to indicate the speed/sensitivity.As a mouse it is good. Optical mouse, adjustable sensitivity, upright stance, puts the mouse cursor where you want it. It has outlasted the Anker wireless vertical mouse I bought around the same time whose scroll wheel has started becoming unresponsive. A bit expensive, but I'm hoping this and my trusty Microsoft 4000 keyboards will fend off carpal tunnel / RSI a bit.

I've been dealing with tennis elbow for the last year and a half. I was forced to stop working out in the mornings until it healed. Even after months of inactivity, however, I was still have issues with my elbow. After doing a little research, I discover a related condition I'd never heard of before - mouse elbow. Because of the nature of my work, I'm mousing all day long. I concluded that pronating my hand all day, was contributing to my tennis elbow, and lack of healing. I needed a solution. After reading the reviews, I decided to give this mouse a try. I purchased it and set it up at work. I can honestly say, in the thirty plus years I have been using mice, this is the most comfortable mouse I have ever used. It took very little effort to get used to it. It keeps the hand in a natural "hand shake" position, and once I'd adjusted the speed and tracking, I found it took very little movement at the wrist, to manipulate my cursor across the span of my two screens at work. I was so pleased with it, I purchased a second one to use at home, which brings me to why I gave it four stars instead of five.At work I use Windows 7. At home, I was using Mac 10.11 (El Capitan). The mouse worked fine at first. Once I upgraded to Sierra, however, the mouse became a door stop. Nothing functioned as it was supposed to. Most of the buttons were dead, or stuck in one function. Yes, I know. My fault. I wasn't paying attention. I wrote to customer support about the problem. They responded that new drivers with Sierra support were on the way, and should be issued in about a week. That was three weeks ago and still no updated drivers.To be fair to the company I should have waited to upgrade the OS if I wanted to keep a functioning mouse. And, this isn't the only company whose product has had issues running with Sierra. It begs the question, however, with Sierra having been months in beta, so companies like Evoluent could write drivers before the official release, why do these companies wait until after the official release to suddenly discover their product doesn't work? Why make your customers wait weeks, sometimes months, after an official release to START working on the driver problem.In conclusion, the product gets four stars for great construction, and if you run Windows, great drivers that let you configure the crap out of this thing. One star gets deducted for poor preparation for the Mac Sierra release. At home, and until the updated drivers are release, the mouse is little more than a door stop.

I have the wired version because I read all the negative reviews of the wireless / bluetooth version. Purchased Jan 2016.Pros: Does what it says on the tin. It's a vertical mouse.Cons: I had an earlier version of an Evoluent and it was much less gaudy and it was easier to setup on osx.- Bright blue light on the back of the mouse is pointless, distracting, and burns battery power even when the laptop is closed. I'm generally opposed to blue LEDs but this one is particularly distracting and serves no value. This is my only major complaint.- The driver software allows you to select actions to assign to all the extra buttons, but they don't allow you to actually customize. I'd like to have the 5/6 buttons near the thumb select next or previous tab on my browser, but that's not an option they thought to put in the dropdown, so I'm out of luck. I'd also like to switch spaces with a chorded press (6+2 or something) but it requires changing the keyboard shortcuts to the osx default settings. The Anker mouse does not have this restriction, it allows you to record whatever keypresses you'd like to attach to the extra buttons.- Drivers: On my MacBook, running OSX 10.11, the driver install is required to get functionality out of buttons other than the basic two, and the driver install requires a 1999 style reboot of the whole computer. For a mouse, this is excessive.- The website has irritating autoplaying video, which isn't great for downloading the drivers in an office environment without being distracting to others. The direct download for the osx drivers is here: [...]Update (May 2016):After about 4 month of use, one of the thumb buttons failed. I believe the failure was a component failure, not a design failure. Regardless, Evoluent was very helpful to send me a replacement under warranty. While they had my mouse, they noticed I'd taped over the blue light, which is my biggest complaint. Here is part of the email they sent as a reply:If you don't like logo, you can turn it off.Logo off :Unplug the VM4, press and hold down "-" pointer speed switch, plug in themouse and release the pointer speed "-" switch.Logo on:Unplug the VM4, press and hold down "+" pointer speed switch, plug in themouse and release the pointer speed "+" switch.

This really helps with carpal tunnel and wrist pain.The finish is terrible. It gets soft just from your hand oils and starts rubbing off after a year or so. I saw another review that said that alcohol would dissolve the finish, so after it started coming off, I used some alcohol on purpose to remove all the loose finish. The slick plastic that is under it actually feels nicer to me than the original finish. I don't know why they felt the need to use such a terrible coating. It's not like there aren't finishes out there that can be in contact with hand oils and not dissolve.

So I originally bought this mouse because I was having tendinitis problems in my arms and needed to change the way my arm was resting on the desk etc. The mouse feels great, but I was unable to use it right off the bat because unlike a normal mouse, you kind of have to grip this one with a bit more force when clicking, otherwise you'll push it off of your pointer target. The extra gripping for sideways clicks didn't help the tendinitis, so I am saving this mouse for once I'm healed.Otherwise, quite comfortable! Took me less than an hour to get good at clicking without having the mouse pointer move off my target =)

This thing is a life (or job) saver! My hands are messed up and using a conventional mouse hurts A LOT after a fairly short period. I'm also a lefty, which limits my options further. Luckily The Vertical mouse has me covered.The only drawback that caused me to remove a star is the fact that the low friction pads the mouse rides on wears out after six months or so of heavy use. This makes the mouse "Feel" a bit different as the entire bottom surface is then rubbing against the desk. This changes how the mouse feels, and not in a good way. That issue would be just a minor thing if it didn't also cause the DPI setting button on the bottom to sometimes trigger. Many times through the day now I have to stop, turn over my mouse, and reset the mouse speed. This pad wearing is not something I've ever noticed on other mice.Having a mouse I can use makes it worth it to me to re-buy this somewhat expensive gadget a couple of times a year. But I wish I didn't have to.

i purchased this as a possible solution to my tendonitis. so far it's working pretty well, it does take some getting used to, but by the nature of it's design it helps avoid bad mousing habits. i think i will keep working with it for a few more weeks.

I bought the Large originally based on the measurement chart. I was 1 cm into the Large range, but I am returning it in exchange for the Medium. The side of my hand didn't reach the base of the Large mouse, so I was having to hold my hand elevated to stay centered on the buttons. I like the oversized wheel, but wish it had a way to increase its resolution. The vertical hand position is very comfortable versus the strained horizontal feel of a regular mouse. Be aware of the size of the base, especially if you like having the mouse close to your keyboard. The Large base seemed to bang against the side of the keyboard and against the front lip on my working area and limit my range of motion somewhat. The Medium should be better, but be aware the base is still significantly larger than a standard mouse. The pinkie "button" is just a toggle switch. Whichever hand you grab it with, if you depress your pinkie, the toggle will flatten for that hand's grip, indicating which "hand" you want the mouse behavior to be (reversing the left and right click buttons).

I've been using it for a few weeks. My hands and wrists feel better now. My only complaint is the size of the unit -- it really takes up a lot a desktop space. Nevertheless, I would recommend this product.

Count on at least two weeks of getting used to it, but then it's smooth sailing. My shoulder pain is almost gone after about a month of use. I do switch hands several times a day and that helps. While I was getting used to it, I kept touching the "wheel" on top, which starts the scrolling. So my "brotherly love" got quite tested during those two weeks. Now, I very rarely touch the wheel by accident. All in all, it was worth buying it. If you have shoulder or wrist pain and are ready to suffer for a week or two, I suggest you get it. However, if you are in the middle of an important rush project, then wait until you can spend some time getting used to it.

The BEST ergonomic mouse to help for my carpal tunnel. The bottom (right click) button sometimes sticks. A great ergo mouse.

There is no scroll wheel, which I hate. Otherwise it's a fun way to change things up.

I've used this mouse for several years, and it has allowed me to continue using a computer fully despite repetitive strain injuries (RSI).However, there is a problem where around once an hour the mouse it will misread the movement and instantly jump a huge distance right and up, landing in the top right corner. Since I have multiple displays, OS X, and hot corners this problem does get in the way.It is also important to realize that this mouse will not be as quick or accurate as your typical high quality desktop mouse because you move it with your whole arm rather than your fingertips, and there is no mouse wheel. I simply got used to using the scroll bar, arrow keys, page up, and page down instead.Despite the issues, this mouse continues to provide the strain relief I need to work that no other mouse has matched. My particular issues are with making the same fingertip motions over For those dealing with RSI pain I recommend you try it. Not every mouse can solve everyone's problems but this one may help you. If they ever update the sensors and eliminate this problem I'd give this mouse the full 5 stars.

The good part is that my right shoulder is relaxed when using the product.Just my pet peeve but there is no way to scroll down or up any window aside from panning on some applications; that's about it.I used this for almost everything-from creating documents, Web browsing, to first-person shooter (FPS) gaming. For document and Web browsing it is okay. For gaming, there are other better, in terms of response time of the clickers, and cheaper, in terms of pricing, vertical mouse out there.Documents and Spreadsheets - 2 of 5Image Editing - 1 of 5Web Browsing - 2 of 5FPS Gaming - 1 of 5Reason of 3-Star Rating: Even though the rating on individual tasks are on 1's and 2's; the comfort that it provides on my shoulder made it 3-Star instead of 1- or 2-Star.

This thing is growing on me. The right click/left click part is very easy; scrolling and selecting text more difficult It takes a little getting used to, but not too bad. I still have my other mouse plugged in, and on occasion, I've resorted to using it when i got frustrated with a cut and paste operation, but for the most part, it works pretty good.Two criticisms:1) The one I got is a right handed mouse. I had thought it would be ambidextrous. I prefer to use my left hand for mousing, but I can adapt. That said, I think they should tell you that it is right handed.2) The scrolling mechanism takes a bit more force to use than is optimal, IMO.Update...downgrading it from four to a three. I'm not so sure it is much better than a traditional mouse.

I have read some of the other reviews about scroll wheel issues, but that is not the big problem with this mouse for most users. I don't think most people use the scroll wheel anyway.But there is a big problem with this mouse.I just bought this a week ago and my first overwhelming impression is of how strange a design it is to have the main mouse button be thumb-operated as this mouse does. It's still bothering me a week later.So that would be bad, but what is worse is that with this mouse thumb-operation is the ONLY option. You cannot fix this or try different button arrangements using mouse settings!But the first reaction is I find it amazing that 3M wants me to now use my thumb to click when I've been using my forefinger my entire life. And when I'm not using this mouse, I will still have to use my forefinger. But they want me to get this thumb habit for some reason. But if there were a benefit to the thumb click, it could be understood, but there seems no benefit. The forefinger is the proper finger for clicking it seems to me; my forefinger just seems vastly better at clicking than my thumb, and inherently so. And the thumb to me seems to bring a variety of issues, not just that one is not accustomed to it, but that it doesn't make any sense to try and get accustomed.So the thumb issue is the problem, but what is worse is that you can't get around it as you might think you ought to be able by simply swapping mouse buttons. The right-click on the 3M mouse is also done with the thumb, and while Windows will let you swap right-click and left-click, it will not let you swap left-click with the scroll wheel button, which is all that large button (visible in the picture) that is on your non-thumb fingers does. So before buying I thought I'd have some flexibility about assigning buttons, but actually I have none. You can make left-clicking be the the thumb, and you can make right-clicking be also the thumb on the upper side of the thumb button, or vice-versa (the thumb button is a rocker). But you cannot get left or right-clicking off the thumb using the typical Windows control panel settings. Of course it would make no sense to make the up-side of the rocker be regular clicking, since that is a much harder click, so this means you have no flexibility at all in assigning buttons with this mouse.So this seems the big downfall to me of this design. If they had made the non-thumb button right-clicking, then you could swap these, which MIGHT help, but since they designed both clicks to be thumb operated, you can't even try that.Now you might reply, "Well, my mouse control panel is super fancy and I can switch the middle-click with left click no problem!" But you STILL will have a problem with this mouse. The geniuses at 3M did not put the side button where your forefinger can easily get to it! They put it where only your second and third fingers are positioned. As a result, if you want to click with your forefinger, you're just out of luck, because you have just dead plastic under that finger.What I don't understand is why they didn't simply add a button to this thing, one where your forefinger goes, which interestingly they have a well-defined spot for. Then they could keep that long button that they already have, for second and third fingers to use. Seems it could have been so simple. Just click with forefinger and right-click with one of the other fingers, just as you do with other mice.Yet I'm not returning this (yet), though it cost over fifty dollars, because it does ease the wrist issue, my main purpose in buying this. But for an expensive mouse, you would think you'd get some button re-assignment options. And this thumb thing may yet drive me absolutely over the edge and at some point in the future this mouse may end up in pieces, smashed on the floor from aggravation. We'll see. I'll try to check in after more time has passed...

The flat of my hand measures 3.5" which according to the instructions on their website is the small size. It was to small for my hand and curling my fingers around the "stick" was painful. Not a relaxed position for me at all. Pushing the base around a mouse pad felt like it was giving more resistance then a normal mouse, probably due to the added weight of your hand. Also, the product felt very "plasticy". For the price tag I would expect something that was perhaps padded or at the very least feeling solid. It also needs more buttons and the buttons need to be customizable. The scroll is fair to ok on this but not great. My arthritis is extensive in all my joints, being in IT my wrists are pretty bad as well. There is a bit to much shoulder motion for me with this and I have a lot of shoulder pain. This might be right for some but not for me, I had to return the product. I gave it three stars because I think this product may very well be a great fit for persons with arthritis that affect them in different ways then myself.Side note: I probably would have tried out the larger size if this product was not so "plasticy" feeling.

This mouse definitely helped the arthritis in my index finger from overusing my traditional mouse; however, because control of the mouse is done with your entire hand, it doesn't navigate smoothly on the screen and is slow to react. It's ok for now, but I'll continue doing research for something better.

Pros: It's comfortable, fits my hand and keeps it in the right position, it moves smoothly, it's lasted for close to a year
Cons: This is huge; it has no scroll function other than mousing over to the side of a page and pulling the tiny scroll bar down. I have to use two different mice (mouses?) to accomplish anything quickly.

It is a little small for my hand, and I surely don't have large hands. The size is only slightly off, but it is noticeable when I first hold it. It is quite comfortable to hold, though, and the thumb click is a really nice change. In general, I would say it is better as a point and click mouse, on larger areas of the screen. It is a little harder to move to very specific points on the screen than a standard mouse and the scroll function is not ideal (equivalent to clicking the mouse wheel).

I would suggest to use this mouse in conjunction with another mouse. It will give you the chance to rest your wrist and forearm, but I doubt it will be suitable to fully replace another mouse.

Initially I thought this mouse was the solution to resolving my RSI symptoms. It worked well in the beginning and I didn't have to wear wrist splints. However, after one month, my symptoms worsened and similar to a previous review, I developed a severe sharp pain to my right wrist joint radiating to the entire R forearm muscle that did not go away. I eventually had to take one month off of work to rest and still I have not returned to my baseline. I ended up purchasing a split keyboard, and two types of ergo mice that can be used with both the left and right hands. The downside to this mouse is the inability to use with left hand and it requires you to use your right forearm muscle continuously. If you are suffering from RSI, better to use mouse that can be used with both hands, take frequent breaks, use proper ergo, split keyboard and choose two different mice that you can switch from week to week.

The position was interesting and it did seem to reduce wrist strain, but the stress was transferred elsewhere for me, plus it was difficult to control. I don't know if it's because my keyboard tray wasn't quite right, but it felt a bit unnatural to use. Plus the lack of a scroll wheel really is a downside. I guess I've gotten way too used to a scroll wheel to stop using it. Add that to the fact that it's kind of tough to control, and moving the mouse cursor to the up and down arrow buttons and scroll bar to scroll was just too much for me. Plus clicking with the thumb was not something I was used to and that did create some strain for me, but everyone is different. I ended up returning the mouse.

I switched from a Razer Mamba 2012 to this mouse about two years ago. The vertical design definitely helps with wrist strain when mousing for more than a couple of hours. I use a computer 12+ hours a day, so that's important. It's also nice to have a dedicated middle button instead of having to click the wheel. Unfortunately, while the VerticalMouse is a decent step up in wrist comfort from the similarly-priced Razer, it's a huge step down in build quality and durability.The VerticalMouse has a cheap, plastic-y feel that would be acceptable from its $20 competition, but not from a $80+ device. The finger contact surfaces are made of smooth, shiny plastic that makes my fingers sweat and needs to be cleaned frequently. Worse, after about a year my skin oils started eating away the matte coating on the palm area. Worse still, here at the two-year mark mine is starting to break down. The debouncing on the left button is failing, so about half the time single-clicks get turned into double-clicks. Sometimes it just shuts off entirely and needs to be unplugged to reset.I also suspect it doesn't really fit my hand properly. I have rather large hands, and with the regular VerticalMouse my little finger either rests on the table or feels squashed if I keep it on the mouse. It would be nice if there was a large model in addition to the current small and regular.In short, this was a decent mouse for a couple of years, but now it's failing and I'm not going to buy another one. I'll go back to the Razer (which is still like new after being used for three years) while I research other ergonomic mice to try.

I liked the idea of the vertical mouse having a natural hand position, but I found the reality was not what I expected. The mouse feels large and because you put your hand in a vertical position, you have to "squeeze" the mouse to keep your hand in place and move it around. It was awkward and tiresome to use.

I have used a 3M Joystick (Renaissance) mouse for several years, a good design that has really helped with carpal tunnel syndrome. I like the 3M's rocker switch, vertical orientation, hand support, and fairly fine degree of control. However, it has two issues: the narrow column of the joystick requires a good grip, and the raised baseplate can press on the wrist. So, I decided to try out the Evoluent as another option in my RSI mouse parade, to even out some of the stresses.Being focused on the fact that the mouse is vertical, I didn't pay too much attention to the mappable button feature on ordering - but I'm now finding this is a great strength of the design, as you can map the buttons to those fingers that have the most control or are least affected by RSI.My one initial concern was that the required "pinch" grip might add stress, as it is also somewhat slippery.Two nits: Don't need the lighted blue logo at the base -- a waste of energy and too bright; and the USB cord is very long for something that sits right next to your computer. This cord should at least be removable from the base of the mouse, so one can switch in a shorter cord.Overall, this seems a well made product and is definitely of value to people not only with RSI but various hand problems who need something that is larger and easier to grasp than the typical mouse, and with buttons in a variety of locations that can be mapped to work with their strongest fingers or deal with tremor/spasticity.**Update: To keep the hand-wrist-arm in a "straight line" position to not bring on numbness does require having some type of pad (like a gel wrist rest) to support the lower arm.**Update 2: Something to watch out for if you do a lot of mousing. I used this mouse only in the evenings for light computer work/gaming for a couple of years. Then, I switched last summer to using it as my main work mouse (8 hrs+ a day). Unfortunately, this extended time using the "pinch grip" required to hold the mouse quickly brought on De Quervain's - inflammation of the tendons of the thumb. It is now sometimes quite agonizing to hold the mouse and draw it back. I hate to give these mice up but I'm going to try switching to a different design for awhile that doesn't require a grip, and see if I can eventually go back to using this as a "light duty" mouse.

This is a great mouse. The "handshake" position is much more comfortable over long periods than the palm-down position -- at least for me.Unfortunately, as of July 02, 2013, there are no Windows 8 drivers available. Do not install the existing Evoluent drivers under Windows 8. The mouse will not work at all.The only driver that works is the generic Microsoft mouse driver. In this configuration, the mouse buttons are not programmable. I like to program a dedicated mouse button to generate a double click with one physical click. Rapid double-clicking causes me hand strain. No dice without drivers.Evoluent support says that the company will write drivers but they don't know when. The lack of drivers is forcing me to consider going back to a palm-down mouse.If Windows 8 drivers existed, I would give the product 5 stars. Until/unless that happens, 3 stars.

I have owned the Evoluent Vertical MOuse 4 Right for about 2-1/2 years now.The good: Really does ease wrist/arm/shoulder pain when using for long periods compared to standard optical mouse. Nice feel, fits my hand well.The bad: Has electrical/mechanical quirks. Explanation:After about one year with the mouse, the cursor started jumping around on the screen as I was using the mouse. It was very erratic, and very frustrating.The mouse would occasionally freeze up completely, and the blue logo would go out, indicating a loss of USB power. The only solution to this problem was to reboot the computer.The frequency of the problems began to increase to a point where I could not use the mouse.In order to eliminate the possibility that the problem was the OS (Windows 7, 32-bit), or the computer, I performed the following tests:1) Used the mouse on Ubuntu Linux which was installed on the same computer (dual-boot). The problem persisted.2) Eventually I had to replace the motherboard in this computer (for reasons other than the mouse). When I started using the mouse on the new system, which now has Windows 7 64-bit installed, the problems persisted. Again I also tried the mouse in Ubuntu Linux and the problem persisted.3) Used another mouse on the same USB port. No problems with the other mouse.Eventually, I contacted Evoluent support and, after several e-mails between us they decided to replace my mouse, even though it was out of warranty. I had to cut off the cord on the old mouse and send them a photo of it to prove that the old mouse was unusable. I received the new mouse in a few days.Well, the results are in, and I am still not a happy mouser.The erratic cursor movement is gone, but now I have another problem. The left-click does not always take. In other words, I click the left mouse button, but Windows does not respond, and I have to click it again. This happens quite often, in many applications, but especially when clicking buttons on web pages or applications.Swapping the right and left mouse buttons does not seem to fix the problem. That leads me to think the problem is either with Windows or in the mouse's interface (driver or hardware).If I hold the mouse button down for a longer period (which is far longer than is normal), the problem lessens, but does not go away completely.I have tried using the mouse with both the default Windows driver, and the Evoluent driver with the same results.I have not yet tried the Evoluent mouse on another computer (I don't have another computer that is usable for most of my applications), but I have connected another mouse (actually a trackball) to the computer, and have not had any of the problems with the trackball.I suspect that the trouble is with the hardware inside the mouse. It is not the actual mouse button, but the electronics that reads and processes all of the mouse buttons and sends the data along the USB cable to the computer's USB port.I ran a utility that tests the mouse buttons, and found that occasionally when I click the left mouse button, I get a double-click instead. I don't think that would cause the failure to register a left-click (double-click will normally do the same thing as a single click for buttons on a website or in applications), so I really don't know what to think.I will not try another Evoluent product, as I believe that, considering my problems with not one, but two of the same model mouse, they are having design problems. Perhaps they will come out with a Vertical Mouse 5, and I can convince Evoluent that they should give me a beta version of the new product for testing (well, I can dream, can't I?).I am pretty much at the end of my rope for dealing with this mouse. I am probably going to purchase a new gaming type mouse to replace the Evoluent. While the gaming mouse will not be as easy on my biomechanics, at least it will ease my mind when it works properly every time.At this point, I do not recommend this product.

Just a quick video review of the Evoluent Mouse. I discuss some pluses, some minuses and my overall impression of how it works for me.A point I don't clarify in the video is when my hand feels good (nerve problems aren't flaring), I still prefer to use a normal mouse over this. It's just easier to work with. I'm also ambidextrous a bit, so with a normal mouse, I can use either hand if need be. This mouse is only good for my slightly-dominant, right hand.Finally $89 (or something near there) is a LOT to pay for a mouse that doesn't entirely fit the bill. It would be a real coin flip whether I would buy it again (for that much money anyway) now that I've worked with it a bit, and I'm not so blown away by it.

Good product but could not use with my Mac Book.

Love the ease of switching between right and left hands. It is much more comfortable than a regular mouse and has allowed me to work pain free. There is a bit of a learning curve, but not bad. The setup was easy, just plug it in and go. I am however finding that l have a lot of false clicks. The function of the buttons is not clean. Have only been using it for 2 or 3 weeks. Hoping I can master the clicking problem but not convinced. That would change my rating to a 4 star.

Quite comfortable to use and it has helped with wrist and elbow strain.However it is not very reliable - the pointer suddenly shoots off to the top of the screen for no reason every so often and I need to reboot it several times a day as it simply stops responding.Overal - Okay but i wouldn't but another

It provides what it promises: A mouse where your wrist stands in a neutral position.It is expensive though, in the end it is just a plastic mouse with a joystick shape and a cheap feel. Next time I will look for a cheaper alternative.

While this can serve you as your alternative mouse this product doesn't provide the accuracy needed for modern gaming or fast enough to support quick rotation. Buy it only if you are planning to use it for office and low intensity works. Yet even that's your purpose, you still are paying way too much for just a 10 bucks quality mouse that's just shaped differently

I purchased this mouse because of carpal tunnel syndrome and has been using it for 6 months...Pro: it did alleviate my carpal tunnel pain and i was able to work normallyCon: after only approx 6-7 months of use, it no longer works properly. My mouse is not being detected by my computer despite the red signal light on the usb and the laser light on the mouse being lit.

conceptually, its not bad, but it has one fatal flaw, there is only one physical button under your thumb, which can be rockered left (for left click) or right (for right click). There is no way to hold the right button while activating the left, as many software programs assume this ability.So, for straight vanilla usage, it works, and it may help save your wrist, but I can't use it with about 1/3 of my normal programs.

This is for elderly people who doesn't move their wrist very well. If you try to use it to scroll or point any web link it will frustrate you. It is very inaccurate and because it forces you to use your arm it's very cumbersome. Afterawhile it hurts the shoulder more than the arm so it's not really well thought out. Too slow, inaccurate, and tracking is a bit jerky because it needs your arm to precisely navigate.

update: I ended up tossing mine in the junk drawer. It was just too difficult for me to use comfortably. |I've been using this mouse for about a week now. I use a mouse all day long. I've used lots of different kinds of mice to alleviate finger pains. I didn't buy this one to alleviate any carpal tunnel pains rather I bought it because my index finger was really sore at the last knuckle from left clicking all day long. Here's what I really like: the single button at the top of the stick that does both left and right mouse clicks with the thumb is pretty slick (no more sore knuckle). What else do I like? Not much, by comparison to a regular mouse. Not having a roller wheel is practically a deal breaker. Instead of the wheel, there is a pistol grip style button that is hard to reach and awkward to squeeze. Reaching for the joystick style pointer takes a little re-training, too, because it's taller. Finally, using this as a pointer takes a lot more movement. I wouldn't be able to use this with a mouse pad because it takes a lot of space to maneuver the pointer. Occasionally this sticks to the desktop. If you don't do a LOT of computer usage and are experiencing a lot of pain because of a mouse, this is probably a tool worth trying. It is definitely a pain relieving tool for me. There is a lot of downside to making this a workable replacement over a standard mouse. I am trying still to decide if I can live with what I don't like.

This design was great for wrist, elbow, arm pain. I used it constantly for a week. I expected it would take some getting used to as most people aren't used to the subtle motions involved with this grip compared to a normal mouse. That aside, I would not recommend this product for anyone who does complex things like surf the internet or work a spreadsheet. The button configuration is clunky and not intuitive. For some reason they decided that the large finger button on the side would be both the "hold for scroll" function, which then requires you to move the entire mouse to scroll, AND if you hit it quickly, it goes to any hyperlink you might have the cursor resting near. I'm sure there are software patches and settings I can mess with. I don't have the time or inclination to waste my time "discovering" how to set the mouse up. Bottom Line: It didn't have a scroll wheel and that alone made it not worth it. I returned it.

The scrolling capability is missing.

Isn't an easy plug and play. You have to sometimes press the "connect" button under the mouse. Sometimes it works. It's not the easiest to work.

Ergonomic wise, it still does a great job. I own one over 10 yrs ago, and love it. You would think they would improve it to enable an easier scrolling ability.

This does not work on Windows 10. Ordered small and it is too large.

Comfortable, but they need to get with the times and offer a smaller stay-in dongle. There's hardly any point in making it wireless if it's not really good for use with laptops.

They also need better browsing features like a scroll wheel and back/forward buttons...navigating without these features requires extra movement and clicking, which contributes to fatigue. Would be nice for gaming too.

I end up only using this when I'm in pain instead of all the time.

Get the wired version. Wireless is very frustrating. It sometimes doesn't register actions. So sometimes you find yourself clicking on things several times in order for the click event to happen. Or sometime it gets stuck on a down-click, so you end up dragging windows or other items around. It's very frustrating. This never happened on the wired version. Maybe they used some cheap components during the conversion.

I purchased the mouse to see if it would alleviate some of my carpal tunnel symptoms. Using the mouse required me to rest the side of my arm against the keyboard tray which put pressure in a different, more sensitive location. The scrolling mechanism is unnatural and I couldn't get used to it even after two weeks of use. The movement of the mouse required more manual movement than a normal mouse and the USB device was larger than normal so it may be difficult to use on computers where the ports are spaced closely together.

Overall I've had a poor experience with this. The upside is it does help me use the mouse a lot longer without suffering RSI related issues. The pitfalls are too much to overcome, unfortunately.As other reviews mention, this mouse has a problem with missing clicks. I've tested it and it happens on average of once every 30-50 clicks, where a click will not register. This makes working on the PC very frustrating as you end up waiting for an action to happen only to find out it didn't because the mouse ignored your click.It also has a problem where it will act like the button that has been clicked and released is instead still being held down. This has occurred with both the left and right buttons, and occurs for about 1-3 seconds after the button has been released. Occasionally the mouse will simply stop responding completely and the only way to resolve it is to go to the back of the PC and physically unplug the cable and replug it back in.I have attempted everything I can think of to eliminate these problems with zero success. I updated to the latest evoluent drivers. I uninstalled their mouse manager utility. I changed usb ports on the back of the PC multiple times. I even tried completely uninstalling their drivers in case it was a driver bug. The problems persist regardless.The navigation back and front buttons are by default mapped non intuitively and the only way to resolve this is installing their mouse manager software to remap the buttons. The rubber grip on the mouse began flaking off after only a few months of use. The USB cable is extremely thin and flimsy and makes me suspect the clicking problems might arise from poor usb signal integrity. The build quality falls far short of what's expected for the money paid.In summary, what was supposed to make my mousing experience less frustrating and fatiguing has in fact had the opposite effect. I have RMAd this back to the manufacturer, and will see how things go from here.

This mouse is most definitely not worth the money that they are asking for it. It may work for other people, but all it did for me was to take my wrist pain and rotate it slightly to a different part of my wrist.Let me be clear and state that this is not a 'Vertical' mouse. It is close, but definitely still at an angle, albeit a steep one.*UPDATE - 6/22/2016*I just got back from vacation and after taking a week off and not touching a computer mouse or keyboard for the duration, my wrists felt great! Until I started using this mouse again... I've been using it as my primary mouse at work for the last 2 years (or so) and I thought I was doing alright even with my negative feelings towards the mouse and the constant slight pain when using the mouse, but now having spent a bunch of time away from a computer, I can very definitively state that I have a used VerticalMouse 4 for sale.With all the time I've spent with this mouse, I want to like it, I really do, but I just can't in good feeling recommend this mouse. I haven't had any of the cosmetic issues some other people report and even though it does feel like cheap plastic, it has lasted through 2 years of consistent 40-hour work weeks.The thing that bugs me the most, and I thought I could get used to, is the funky angle of this mouse. Its not vertical (as I stated in the original review), its slightly off. They state that the mouse is designed to be a comfortable 'hand shake' grip, but who shakes with their palm down?Imagine this: reach out your mouse hand for a hand shake (my palm is ever so slightly facing upward) and then, without changing how your hand is held out, rotate your wrist to where your palm is vertically straight (if you are right handed, this rotation is counterclockwise). Pause for a second and enjoy the vertical feeling. Now rotate your palm further another awkward 30ish degrees and that is where the mouse will hold your hand. Not a comfortable position for me.Why did I stick with it for two years? I'm the kind of person that when I spend a large sum of money on the 'truly ergonomic mouse' I want to believe that it will be good for my wrist, but, as many other suckers can tell you, just because you spend a lot of money on a product doesn't mean that it is good for you.

After seeing all the glowing reviews that mentioned "immediate relief", I was hoping to experience the same. Unfortunately for a number of reasons I was left disappointed and will be returning this mouse. Specifically,- Buttons are extremely sensitive...EXTREMELY. The lightest touch sends them clicking away, dragging and dropping bookmarks, folders, files, and anything else you really didnt want relocated, cut, copied, pasted, and generally FUBAR- Size is big but not big enough for anyone with large hands. I'm 6'5, have proportionally sized hands, and found myself having to perform finger yoga any time I wanted to use the scroll wheel- Quality of build is cheap and lacking. The mouse is VERY light weight, feels cheap, and the slippery plastic buttons get an oily, dirty feel almost immediately.- Drivers & Software have potential but just don't function correctly. This could very well be local settings, other drivers, and anything else related to my machine. I was simply trying to deactivate the right mouse button (see hyperactive click sensitivity above), but despite re-installing this drive, uninstalling all other mouse software, and trying repeatedly, the right mouse button still fired awayThis mouse is basically a great idea not done correctly

Summary: Better products available at a fraction of the cost. The driver software is primitive compared to what is available today at much lower cost. The mouse was first released years ago. My guess is that the company has been milking a cash cow without updating their product.Ergonomics:Not every hand and arm is the same so there is no "right" ergonomic design. But I've been very comfortable with other so-called Vertical mice but they supported approx. a 60 degree angle of the hand and forearm. The Evoluent design wants the hand at nearly 90 degrees. After trying the mouse for several weeks that angle still feels too extreme and I use the mouse with half my hand in the air so I can get to a comfortable angle.Not enough room for little finger. When using the mouse as designed my little finger would often go numb.Driver Software: Software is the secret of any mouse with more than the 5 buttons that Microsoft supports. Mouse software designed for gaming supports as many as 11 buttons where every button can be customized to do anything including running a macro that executes several clicks and/or keyboard keys.Macros: I couldn't get them to work. There is a primitive "Keystroke Recording" setting with the Evoluent mouse driver but I couldn't get it to work. In general Evoluent's software is downright primitive next to those offered with gaming mice which are often sold at a fraction of the cost.The mouse driver is advertised to be customizable for different programs. The claim is only partly true. Not all features can be customized differently to work with different programs. The scroll wheel can be set to scroll up or down but only one setting is allowed. The very first feature I tried to customize with the mouse was to scroll 1 line with editors but scroll several lines when using a web browser; that is impossible with the Evoluent mouse.

I work on a computer all day long and often into the evening. The keyboard doesn't really give me any problems but the mouse sure does; I get a lot of pain in the forearm. I had hopes this would help but it really didn't seem to have any impact. I gave this several months of steady use and didn't see any difference in pain. I ended up going back to my old solution of alternating hands and giving one hand a rest until the other starts hurting.I find it hard to tell which button the main fingers are on; there really needs to be more definition to the left/right/mid buttons so finger placement is known at all times. This mouse could go a long way toward being more form-fitting to the hand. The cord seems quite fragile, and it is not easy to position the mouse to keep it out of the way. Like others have mentioned, it is a magnet for finger grime and has to be cleaned often. I did not have the problem some others reported of not being able to move the mouse around; I quickly adjusted to tilting the mouse to the right so it did not track and then it is very easy to move to a new location.This mouse does have some nice features like extra buttons for the thumb and easy DPI switching, so I gave it 2 stars instead of 1. The software is not very high quality, and the tray icon serves no real purpose except to display the DPI setting. Unfortunately the mouse did not help with what was 100% of the reason for my purchase, so considering the cost and the problems it's a 2 for me. I no longer use it and one of these days it will probably show up on the shelf at the local Salvation Army.

I ordered this product because I have very large hands and get cramps "clinching" normal mice. This unit was not nearly large enough for my hands but what bothered me mostly was the quality of the product. I have been around/working with computers for over 30years and have had many many mice and know quality from junk. While this mouse was not bottom junk it was definitely on the cheap side. It was so cheap that the wheel clicks were off and it didn't register a "click" until you rolled it through two to three clicks when rolling down. Rolling up worked ok so this was not a software issue. It was clear it was hardware and this mouse felt to me like cheap, made in China junk with very low quality control. I would expect this gladly if it were a $20 mouse but for the price of this thing? I don't think so. On a positive note the design is interesting and I can see would help carpal tunnel, but only if you have smaller hands than me and if you got lucky and got a good copy.

Would have given a 4 star, as it's a moderately comfy position. However, the right click equivalent button (the lower one) started sticking recently, and it is past the return period. Guess I'm out 70$ now, and I will be trying another ergonomic mouse

Pros:-I like the angles when I hold the mouse.-I like the fact that I can move to my left or right hand.Cons:- The left click (upper click) is really stiff and I think it bumps into the scroll from time to time, this is really bothering as sometimes left click works and sometimes I have to press it multiple times. It won't be obvious if I were to try it only once or twice, but it comes and goes as I use, and it's irritating...Thus two stars.- Also, tried pushing scroll a bit lower, and it seems lowering scroll actually gives a click on the scroll (the mouse regards it as the same action as actually clicking the scroll).Dear Amazon & Posturite:I thought this can't go wrong and threw out all the boxes and manuals ...Can I still return this item?

Not helping my muscle issues. Lots of moving side to side to engage with dual screen use. Top clicker not sensitive enough. I measured my hand as instructed but feel like it's just too big for me.

Poorly made had one break after a year, went to replace this one got the new one felt like it was made even worse than the previous model. Returned it promptly.

The design seemed ingenious and I really wanted to like it but it did not work out for me. The top button was just slightly hard enough to click to become tiresome after awhile. If I did not press aggressively enough to hear and feel a "click" the action would not register and I would have to repeat my attempts to highlight text on documents that I was working on. Also, because of the large footprint of the base -and because it is designed for your whole hand to rest on it- instead of moving my wrist (like I would with an ordinary mouse) I now had to move my entire arm to move the cursor around. After around two hours of using the penguin my right shoulder began to hurt just enough that I had to stop using it and take a muscle pain reliever. So far, the pricey Evoluent remains the best ergonomic mouse that I've found with the Perixx PERIMICE-515 as its most economical alternative.

I do like the ergo design. I got used to the movement requirements with this style of mouse. Sizing is going to be personal preference I think. I like the Large, as specified for my hand size, but I could see it being too big for someone of the same size.For my job, I do a lot of 3D modeling which leads to my ultimate complaint:The middle click (scroll wheel) just takes too much force and travel to activate. I think that all of the buttons take a little too much force to activate than is necessary, but the middle one is the deal-breaker for why I'm not constantly using it (it takes about 2X the force of the other 2). It's sitting on my desk next to my main mouse (also a vertical-style, but not 90-degrees like this one, more like 60-70 deg). If I'm in heavy office-mode (doing presentations or whatever that doesn't require the middle-click), I'll make use of the mouse; but it became apparent very quickly that it is not suited for modeling work where one depresses the middle-click to rotate the view (I'm constantly running 2 programs that function this way). The other buttons need the same kind of attention. If the buttons had a light-touch activation, this mouse would be king (for me).Because it takes a relatively excessive force, it always disengages the middle-click function while the button is still down. As a result, you're constantly death-gripping (again, relatively) the button to prevent this from happening. This becomes very annoying very quickly.I would recommend it for someone who doesn't care about the middle-click.

Limited scrolling functionality in some programs...proved to be the downfall of tangos product :( Had to return.

The third button that is supposed to be for scrolling, doesn't do anything. There is no scrolling function on this mouse.

This is why I should read more reviews before buying.I wanted to try a bunch of different mouse devices to alleviate a little wrist strain. I bought this, a trackball, and a few ergonomic 'vertical' mice.This one is just a no-go. No scrolling function in Chrome or Internet Explorer. Which is 95% of what I do.

Use of this mouse gave me De Quervain's Syndrome. This mouse is VERY far from being ergonomic. I haven't used the mouse for many months now and I am still in pain from my short time using this mouse.

I purchased this for my mom because she has arthritis. This mouse isn't for people with serious arthritis like my mom. This mouse requires intricate thumb function to use the left and right buttons and people like my mother will have a very difficult time using the thumb buttons.I had to return it because she was unable to use the thumb buttons at all. If the buttons where elsewhere on the device I think it would work better.

First, this product is very difficult and impractical to use. Whatever speed you can work with on a regular mouse, this is 4-5 times slower (for example, if a task takes 1 second on a regular mouse, it will take 4-5 seconds on this mouse). It is so slow and impractical that you will abandon it after a few minutes of use.Second, I purchased this product thinking the joy stick has a joint and you keep the mouse in one, idle positions and push the stick in different direction and move it (like those helicopter commands). There is no moving joint. It is FIXED so you have to move the entire actual thing around. It is not a light mouse to move.Third, moving around is not so much the problem. The real problem is HOW MUCH YOU HAVE TO MOVE IT just to move the mouse pointer across the screener. You will have to get an Extra-Large mouse pad because will not fit on a regular mouse pad; it has to be moved at least 8 inches just to move the pointer across the screen.Fourth, it feels really awkward and unnatural to use.Fifth, 3M does not even offer a specific driver for this mouse. It does not come with a CD and all sorts of Google searches did not yield a legitimate driver software so 3M has not released one.CONCLUSION: In short, you will be moving this mouse over large distance just for simple tasks. It takes 4-5 longer to use than a regular mouse to use, both because of the distances and because it is awkward and unnatural.It's also over-priced relative to what you get. I really don't recommend it at all.

The quality is very poor. The buttons are so clunky, they actually rattle when you shake the mouse. This is a poorest constructed mouse I've seen... especially considering the high cost. Not only are the buttons clunky, you have to push them in far to make them click. So when your hand is hurting, which is why you buy this, you don't want to be pushing hard on a button. Also, the click is very loud, CLICK CLANK CLICK CLANK CLICK CLANK. I think co-workers could hear my mouse from 10 cubes away.

Have used the wired version of this mouse for at least 10 years, going back to the old rollerball style. My wife uses one, too, and we have probably gone through five or six of them. Only mouse that works for us and we had no complaints. So I ordered the wireless version. Didn't work out of the box. The cursor 'hung,' requiring gross movements of the mouse to get it going again. Didn't matter whether it was used on a Mouserug or bare wood. I really wanted this thing to work and it did not. Also wasn't happy with the USB wireless receiver--does it really have to be that big? I was prepared to live with that, but not the stutter... Returned.

Purchased first one July, 2013. After a few months the computer started freezing and slowing down. Initially thought the computer had a virus. Computer finally quit working altogether. Did a complete format and new installation of software. Computer worked fine until this mouse was installed. Tried the mouse on another complete...same problem.

Order a new mouse Jan 2014. Defective out of the box. Right click button activated the scroll menu and could not be changed.

3M support site for this product is USELESS.

I've used the wired version for years & love it. When it died a few weeks ago I figured it was time to try the wireless version. It worked great for a little while, but then it started freezing. Not sure if the mouse loses contact with the USB connection or what--I've tried pushing the "connect" buttons but nothing changes. At first I could remedy the situation by restarting my computer, which is a pain but at least it bought me some work time. Now even that doesn't work. I'm returning this one & going back to the wired version.

I tried this mouse because I was having wrist pain and thought it might help. After several months using the 3M wireless ergonomic mouse, my wrist pain has eased considerably, but now I have developed pain in the thumb area. My doctor says it is de Quervain tenosynovitis, which is often associated with repeated thumb motion. I have pain and swelling at the base of my thumb. Sometimes when I move my hand at an angle to pick up something or move something, I have intense pain and cannot move my thumb. Then I have to use my other hand to shift the position of my thumb with a "popping" feel to relieve the pain. My doctor calls this a "trigger" effect that is common with this syndrome. So far I have a mild case and hope it will improve, since I am no longer using this mouse. It is quite painful and really troublesome, and is worse than the wrist pain I had before. So, I would avoid this mouse because there is a risk to develop a thumb problem, as it relies on the thumb for mouse clicks.

Mouse pointer is lagging / jumping across the screen when using it on the same desktop surface that both VerticalMouse 2 and VerticalMouse 3 have worked great on previously. The technical quality has really decreased in this new revision, and the premium price of the product is no longer justified.

bought in Feb 17. started scrolling by itself today 5/17. now left button does not work. so now I have and underweight paperweight.Return window ran out 3/22.I have purchased 2 of these. 1 for work and 1 for home.looks like an expensive mistake.

It would be great if it were built to last. After 1 year the left-click button began to treat single-clicks as double-clicks most of the time. I received a replacement mouse under the warranty. Unfortunately, after a bit more than 2 years the replacement has failed in the same way. Now looking for an alternative that is made with quality construction.

The buttons on this mouse do not always work. Sometimes the click is not registered and sometimes it is registered as a double-click. This is the second time that I will have to return this mouse for the same problem.

Got the mouse yesterday. Feels nice in the hand but I'm having the same problem as many of the complaints I'd read before purchase: the left button is intermittent. Most of the time it works but probably 10 times yesterday afternoon, and already a handful this morning, there is no response until you hit it a second time.

I was mostly happy with this product after receiving it. Unfortunately, it soon began to simply stop working every few hours or so. Sometimes the light would go out and I would need to replug the USB cord, other times the light would stay lit and I would need to jiggle the unit for a few seconds to get the cursor to work again. I was unsuccessful at finding a customer service telephone number so email the company instead. It's been four business days since and they still haven't resolved my issue or even responded with how they plan to address it. Moreover, they insist that technical support is by email only. Of course, this is greatly prolonging my ability to have this problem resolved. In the mean time, I have a mouse that occasionally just doesn't work.

I measured my hand as instructed and I was right in the middle of the Medium size. But it doesn't fit. I'm not sure if my hand is too big or too small. The 'handshake' angle feels right (certainly better than my regular mouse) but the buttons don't feel like their in the right place. Also, I had to put it higher than my regular mouse - it's now sitting on books about 2 inches tall. . .the resting position of my hand at the normal height actually tweaked my wrist. I have lost some dexterity - using the big muscles to move the mouse but that would likely happen with any ergo mouse. I've been using it for a week, maybe I just need more practice. The one issue that I think is an actual issue - the button tends to stick. You have to play with it to get it unstuck.Update: May 31, 2016 It started at 3 stars but is now down to one. The button sticking only got worse. Then last week, it fell off my keyboard tray and broke. The 2.5 foot fall onto carpet caused the laser tracking to fail. I'm beyond the return policy so I guess I'm just out the money.

Oh this mouse was just awful, expensive too. I returned it.It keeps your hand in an unnatural straight vertical upright which is almost as bad as a traditional horizontal mouse for wrist strain. Plus it moves in a weird, bulky manner without smooth motion. The wheel is in a stupid position that is cumbersome to use.NOT recommended.

Didn't help with my RSI. You had to make such big movements with it to use it, and it just hurt a different part of my arms. Cool concept, but it didn't work for me.

This product is not something I would recommend based on my experience. I've used evoluent vertical mouse before and I'd recommend sticking with that instead. This product causes shoulder pain. All it does is shift the pain from the wrist to the shoulder.

We bought this for one of our users who has carpal tunnel and by end of first day she brought back saying her wrists hurt more than ever

As an ergonomic mouse, the penguin is a failure. The left click button is simply too hard to press. Any gains based on its upright ergonomic design are going to be countered by the left click button.I have been using the 3M Renaissance Mouse for years now. That mouse has helped out with repetitive stress but it has a slow 400DPI sensor. I was really looking forward to a modern improvement over the 3M. The Penguin is definitely not it.Besides the left click issue, the mouse is a bit too cumbersome to move around. Their customer support never responded to my query as to whether I may have gotten a bad mouse.