SANWA 2.4G Wireless Ergonomic Mouse, Optical Vertical Computer Mice, Silent Noiseless Click, (800/1200/1600 Adjustable DPI, 6 Buttons) Compatible with MacBook, Laptop, Windows, Mac OS

First off, I did find the mouse to be very comfortable and ergonomic. I'm around 5'8", but with larger hands, and the mouse was a perfect fit. The material is that soft touch plastic, very nice feel. Wired, and worked no problem on Windows 10, no drivers needed.My main issue was that the polling rate was only 125Hz, the default for USB devices on Windows, and this meant the movement was choppy on high refresh monitors. With my 160Hz screen, I could notice noticeable stutter just dragging windows around or playing games. For reference, the Logitech G502 (which is what I am used to) updates at 500Hz and is butter smooth everywhere. Sadly, they don't seem to make vertical mice for gamers, I've tried about 7 or 8 different brands and I can't find one that is good for high refresh monitors. However, if you are on a 60Hz monitor and are not gaming, this is probably not an issue for you.Finally, the side has a blue LED that cannot be adjusted or turned off. This was slightly annoying, but I could have lived with it if the mouse worked otherwise. Sadly, I've gone back to my Logitech, even though it does make my wrist mildly uncomfortable, because I cannot stand the choppiness on all the vertical mice I've tried.EDIT: I decided to try the mouse again and I like it. Although it's not as fast as gaming mice, it is so much more comfortable and I'm willing to make a sacrifice of screen smoothness for my health and well being. This is definitely the most comfortable out of the 9 or 10 vertical mice I've tried. Very nice, so I'm updating to 5 stars.

Fast, precise, connected quickly, very comfortable. I especially like the feel of the surface material. I am happy with my choice.

I love this mouse so much because of the fit and size. It fits perfectly in my hand and has relieved the pain in my hand. I've purchased two (two computers) and the first one started having issues with the wheel 3 months in. The company was responsive and replaced it without hassle. The second one is having issues now too. The rolling wheel squeaks when you're scrolling. Highly irritating and distracting. They both started to show issues at month 3. I've tried to reach out to the manufacturer again but no response. It's a bummer because this mouse fits so perfectly in my hand.

Anyone considering purchasing this mouse is likely experiencing some level of hand, wrist and/or arm pain associated with the use of a traditional mouse. That pain is telling us to stop the repetitive motion that’s causing us pain. Traditional mice create tension in the shoulder, arm, wrist and hand. That tension eventually progresses into pain, which is inflammation of the tendons, nerves, etc. We all know stopping isn’t a realistic solution, so what do we do? Change how we interact with the computer. Fix the tension and you’ll reduce the inflammation. Do nothing and you’re on your way to carpal tunnel or some other repetitive stress injury.The Sanwa Vertical Mouse simply rotates your hand which in turn rotates the wrist and arm. This rotation removes the tension giving the user a more comfortable, healthier way to use a mouse. You simply have to use one in order to fully appreciate the benefits.Mouse operation was as described in product description. It requires two AAA batteries (not included). Bluetooth pairing to my Mac Air was simple. Tracking is smooth and precise. Best of all, this mouse eliminated my hand pain. Loved it enough to purchase a second one for my wife!Seller is exceptional when responding to questions and concerns. You really do have to try this mouse to fully appreciate its benefits. Great product offered by an exceptional seller that might just eliminate your pain and/or protect you from a future diagnosis of repetitive stress imjury. My orthopedic physician recommended a vertical mouse and I’m so glad I took his advice.I’m pleased to recommend this product and the seller. Five stars is well-earned!

I like the size, the hand position, the plastic used, and pretty much everything about it - EXCEPT for the silly racing-stripe LED panel. (Why does every PC accessory need to have decorative LEDs on it nowadays?) The damn thing is so bright it lights up my bedroom at night, so it's currently unused, and will remain so until I can find some paint that will stick properly to the plastic and smother every bit of the light, and I still won't be happy about it because of the utterly wasted energy. I wish I'd been able to find an alternative that did not have the dummy lights, but couldn't, so I just wagered that it wouldn't be too bad. Not so much, sadly.