Kensington Pro Fit Ergo Vertical Wireless Mouse- Gray, White

Let's start off with credentials. I work all day long in front of the computer as an animator and I play plenty of competitive online games on the side. I've owned over a dozen mice in just the last three or four years once I really became a computer enthusiast; everything from 13 dollars, to over a hundred, and in all shapes and sizes, ergo mice, to gaming mice. Suffice it to day, I like to think I know a thing or two about what makes a good mouse.But most importantly of all, I've actually owned this exact mouse before, but it went by a different brand name, Victsing, and was half the price of this Kensington mouse when I bought it. I thought that thing was the bees knees when I first got it two years ago, but boy, I realize only now what I was missing out on. The shape and button placement is exactly the same as the previous one, but the sensor, oh the SENSOR!! Good heavens, you really do get what you pay for.Out of the seven wireless mice I now own--with the exception of a wireless gaming mouse that costs NINETY-EIGHT DOLLARS--this is the only one that has pinpoint accuracy, with no stutters and no cursor drift at all, even when subjected to my COMPLETELY unrealistic testing (which is just me sliding the mouse back and forth AS FAST AS HUMANLY POSSIBLE across half my desk. It's a simple test, but it'll VERY quickly reveal an optical sensor's true performance capabilities, as, at higher speeds, a bad sensor will actually stop registering movement, or even literally begin to register the mouse moving in the opposite direction.) Something about the sensor, or the onboard processing, or maybe just the rock solid connection to the usb dongle of this Kensington mouse, makes this thing perform more like a 60 or 80 dollar one instead. It punches WAY above its class in performance, while still keeping all the ergonomic aspects I loved of the previous brand of this same mouse.The weight is very nice, nothing like a lightweight gaming mouse, but that's absolutely not the point of this thing anyway, so I don't dock it for that at all. It glides very well indeed on the dainty little pads, the clicks are wonderfully light, the shape is still as perfect as ever, even for someone who has miniscule hands like myself. The build quality isn't TOP notch, as I can very easily see overlaps or gaps in the plastic seams, but they occur only in places where your hand doesn't touch anyway, and it doesn't even matter, because it's held together very solidly anyway; no creaking of any sort.TL;DR:Of all the ergo mice I've tried, none feel better in the hand than this one, and the performance is way WAY better than I ever expected at this price point. If you're on the fence, just do it. Unless yours arrives broken, I can pretty much guarantee you won't be disappointed.

came with dead batteries

Love this mouse

I am in front of my computer for at least 8-10 hours a day so Ergonomics are very important to me and I have tested and tried out dozens of different mice over the years. This has got to be my favorite so far. It is easy to hold in your hand and is very responsive with no lag. The scroll button is easy to use and is easy to clean also. Battery life is great also.The only small thing to improve on, is I wish it also had Bluetooth so you could use it with Bluetooth instead of just with the nano usb adapter which would free up a port on my laptop.

This has ruined normal mouses for me. Mice? Meece? Why did they have to call it something with a stupid plural? Now it's like I don't know what to call it because, yeah, the animals are mice, but these aren't the animal, so what's its plural form? It doesn't stand for anything- that's a "backronym" where people started with "mouse" and made an acronym and pretended that's where it came from.I wonder if scientists did that with "laser" just because they thought the word sounded cool. "Light Amplification by Stimulated Emission of Radiation" seems a bit try-hard. Why not just shorten it to Light Amplification... L.Amp... LAMP! Did I just create fake a etymological history of the word "lamp"? OK, you totally have to bust that out at the next party you're at and just act like it's well-established fact.Oh yeah, anyway- the mouse is good, I guess.

button makes click sound but I don't mind. Scroller works good. Light and easy to move around. After a few weeks, the back button stopped working until reboot of Windows 11 PC.Update2: the left button fails after an hour or so. To make it work again, take out battery and put it back after a second or two. It will work for a while then need to redo the routine.update: after a month, the buttons stopped responding. Rebooting the PC helped for a while.After it happened once more, it seems left most button takes a while to wake up. The button action on the scroller worked in the mean time. Right lick worked. Turning off and power on the mouse did not work. Unplugging and plugging the USB wart did not work. I think it just takes time after waking up. Strange.