KensingtonPro Fit® Ergo Vertical Wireless Trackball-White (K75263WW)

I’m a longtime user of Logitech trackballs, including their flagship MX Ergo Plus, but with two carpal tunnel surgeries, I’m always on the lookout for innovation in the trackball space. After purchasing a ProtoArc EM01 trackball and using it for a couple of weeks, the Kensington Pro Fit® Ergo Vertical Wireless Trackball caught my attention with its 60-degree vertical orientation, which positions the hand in a safe and natural “handshake” orientation for maximum comfort. The ProtoArc’s 20-degree orientation was one of the reasons I bought it, but the Kensington not only had a greater angle but was fixed rather than adjustable, which I like since I never change it. I tried a vertical mouse recently, and while I liked how it positioned my hand, manipulating a mouse felt awkward after years of using trackballs. My limited desk space meant I was constantly picking up the mouse and repositioning it to move the cursor. The Kensington trackball offers the hand position I prefer, similar to the vertical mouse, and it stays put on my desk. The silicon pads at the bottom of the trackball grip my desk firmly; this trackball isn’t moving!Despite Kensington being a well-known and generally reputable brand, some reviews about the scroll wheel, trackball movement, and cursor control concerned me. However, I have no issues with either of these items; I sense no difference between this device's cursor movement or trackball smoothness and any others I’ve used from Logitech or ProtoArc. Perhaps I’ve used trackballs for so long that I’m more tolerant of their feel and motion. I did change the trackball to a third-party one I like and already had in my possession, although the original trackball worked just fine. If you don’t like the cursor movement or precision, there’s a DPI button at the bottom to adjust the speed.I should add that the white and gray colorway matches my desktop decor, so that’s a bonus. Another nice touch is the button at the bottom that ejects the trackball for cleaning or swapping. It beats using the blunt end of a pen or pencil to poke the ball out of its socket!One more item of note. It takes two AA batteries, which is a deal-breaker for some people. However, after having an internal rechargeable battery on a Logitech device that failed to hold a charge after an extended period of use, I prefer replaceable batteries. Rechargeable AA batteries are always an option.I have only been using the trackball for a few days, but I’m pretty satisfied with it. If anything changes, I will report back.

I got this to replace a Logitech MX Ergo when the left click button quit working. Overall, I found everything on this trackball takes more effort and is less smooth. For most features, whether that's good or bad depends on your personal preference.- The angle is NOT vertical. It puts my hand at about 50°. Ideal would be somewhere around 80°. The MX Ergo only has a 20° angle, with an optional 10° add-on base so this is a better angle than that but still not enough.- The buttons are larger and require a deeper click with more force than the MX. I prefer the easier press of the MX but it is harder to accidently click a button on this Kensington trackball.- The ball has more resistance than the MX. At first it was also rougher. It smoothed out in less than a day but still requires more pressure to move.- The cursor on screen moves in little jumps, not a smoothly as the MX, even on the highest DPI setting.- The scroll wheel also takes more pressure to move, and has a stronger feel of moving from click to click. If you scroll through a lot of pages the difference is enough to be a real issue.- The DPI button is on the bottom, so you have to pick up the trackball to change it. On the MX it's near the thumb so you can change precision with just a thumb click.- This Kensington trackball uses regular AA batteries rather than having a built-in rechargeable battery. The good part of that is you can easily change the batteries, whereas when the MX rechargeable battery wears out replacing it will require disassembly. I use rechargeable AA batteries anyway so they are easy to replace and rechargeable.- There is no USB connection to allow you to connect a cable directly from trackball to your computer. I used the 2.4g USB dongle and it worked with no problems. But this also means no firmware updates for the Kensington Pro Fit Ergo. They do update their drivers on occasion but not the firmware in the trackball itself.Overall, I found the Kensington Pro Fit Ergo to be a step down from my previous trackball. The angle is better but still not enough, and I can build a base to prop my old trackball at the angle I want as easily as I can build one for the Kensington. The easily changeable batteries are a plus but not enough to make up for it's other shortcomings. The Kensington is very good in many ways, thus my 4 star rating, it's not not as good as the similarly priced MX Ergo.

A problem between the Kensington Pro Fit® Ergo Vertical Wireless Trackball and the driver software. I am removing stars due to this glitch.I imported a Pro Fit® Ergo Vertical Wireless Trackball from the USA. It was a large outlay with crazy import fees for me, but critical for my Carpal Tunnel. Which I gladly paid.I honestly believe it is the best on the market. It is immediately comfortable, and you thumb learns how to use it fairly quickly. I use it for everything, with a bit of trial and error - except for graphics.I have the Logi Lift ergo mouse, but because I still have to scroll it around the desk, its not helpful, and the pain starts up quickly as I'm not keeping my wrist still.I use Excel a lot, and write BI reports and this is where a glitch that starts happening after a hour or two of Excel work. The pointer no longer sits in the cell that I have selected.If I chose to type into cell A10, the trackball will start typing into cell A6, that is not selected.I think its usually about 4 cells above where I need to type. And I have to come down rows, and guess where I should be typing.It also seems to loose the top of a long worksheet, and I have to go across to another sheet, (kind of like a refresh), come back to the sheet I'm in, and then it will then scroll up to the top.I have to continually save the sheet, when the glitch happens, and when it starts happening all the time, then I have to shut down the workbook, and reopen it to start fresh.I have not seen any hardware or software updates for a while.