Welcome back to the days of the Unisys ICONs! Except this trackball actually lifts out of its holder for cleaning (or just playing around with), and the buttons are better.
While I have a perfectly good wireless optical mouse (Logitech MX900), my mouse arm was steadily becoming more tense from the longer office hours I’ve been putting in, and the fact that my office hours are filled with more mouse work these days (as opposed to coding with only the keyboard). As is my wont when faced with a problem I’ve faced before, I looked around for a solution that’s better than the ones I’ve tried before (times change, after all).
So far, Kensington’s trackball has proven quite comfortable. Control isn’t really an issue, and it certainly feels more comfortable when my hand is at rest. Since a trackball exercises very different muscles from a mouse, my hand is a little sore, but it’s mostly my palm muscles (probably from lack of use previously). I was a little worried about control, but with such a large ball, it’s quite easy to control. The software that accompanies the trackball is also impressive in its functionality – what other mouse driver software includes a timer to notify me when I’ve been working for too long?