Bests & Worsts Reviews from Amazon

UPDATE August 7, 2020: I was surprised to see how many people tried my setup with such success! (Full disclosure: I'm not the first one to convert this to a vertical trackball, although others may not have used off-the-shelf products.) The MOBI-GO! bean bag stand seems to be unavailable frequently, which is a shame since it fits the Trackball so perfectly. I just bought this mouse for my son and I'm trying a soft silicone smartphone stand as an alternative. I'll post my results in a few days. This is my second M570. With my first, I encountered some of the glitchy problems with the ball tracking noted in other reviews and I used the solution of transferring the ball from my old wired version. But this most recent trackball seems to have solved that problem. The ball scans and tracks perfectly, even if I forget to clean the contacts and dirt builds up. The convenience of the forward-back buttons is outstanding. I also stumbled onto a solution to even further enhance its ergonomic features and minimize any discomfort from long sessions at the computer. I used a MOBI-GO! Phablet & Phone Prop/Stand to convert it into a vertical trackball! I've seen other home-built conversions but this one is so simple, elegant, and effective that it can't be beat. Combine it with a pad like the Kensington Duo Gel Mouse Pad with Wrist Rest and you're in carpal tunnel-free heaven. I've included photos to show them all together. Check out my review at the MOBI-GO! product page for more detail. I miss my old classic Microsoft trackball but the combination of the M570 and these enhancements allow me to spend many hours at work and play with zero discomfort.