I have often thought about switching to one of these as my mouse-clicking finger suffers from repetitive strain pain. Not sure that a trackball would help that particular problem much, but I wouldn't buy one just to try it... what I don't understand is why so few shops actually have mice and trackballs on display attached to a computer so you can try them... how do they expect to convince people that they are the right product to try if you can't "feel" them? The feel of an input device is such an important aspect...