Logitech is horrible when it comes to names, apparently every trackball they make is a "Trackman Marble". I think you're talking about the ambidextrous one with

Logitech is horrible when it comes to names, apparently every trackball they make is a "Trackman Marble". I think you're talking about the ambidextrous one with two big buttons, two small buttons and the ball in the middle. I had the one where the trackball is operated by the thumb[1], which was quite great, at least until I "felt" it. Probably not that bad, but I was worried enough about RSI, and had to use a mouse at work anyway... I actually bought one of the ones you mentioned recently, let's see how that works. As for scrolling, I only rarely use a scroll wheel and do most of my paging with the keyboard, so I always missed a proper third middle button more. So the original design was quite close to my heart. (I also once had a Kensington trackball where you scrolled with a ring set around the ball. Not that great for scrolling, but I think I managed to connect it to the volume in Linux back then…) [1]: https://i.imgur.com/K8tDHfN.jpg https://i.imgur.com/K8tDHfN.jpg