Second that. When I started exploring, I felt most ergonomic stuff had some drawbacks. A thumb mouse / trackball mouse is really imprecise even after long time use, compared to a standard mouse. A vertical mouse is still just a mouse, which takes time (and elbow pain) to move the hand to and from the keyboard.
A rollermouse, though. Don't have to move my wrists at all. It's fairly precise after just a day of getting used to it. It got a scroll-wheel, 5 buttons for right-click or whatever. I'm a huge fan.
Rollermouse is great in all aspects but clicking - its very pronounced. After a while I started to have unpleasant feeling in my joints up to elbows on every click. Maybe it's because I have an old model. Regardless it's the only thing I can use to work right now I recommend people with RSI to try it.
