FINALLY, an RSI-aware review of mice
So few tech reviewers even know about the 3M ergo mouse, or Evoluent's device. Well done, well done indeed. I've toured MS's ergonomics and assistive devices lab (I work at MS's main campus) and gone through increasingly expensive gear (up to a $300 smartnav head tracker) to try to preserve both my wrists and my career. This is simply the best researched review of this incredibly important and potentially career-ending input device. Thank you.
For anyone with serious problems, I'd recommend _good posture first_ then foot pedals and whichever of the devices is most painless to point with.
For what it's worth, here are my ratings of speed/precision vs wrist-saving
Smartnav headtracker: slow but painless. Add speech recognition and you're gold.
3M ergo mouse: awkward and never easy, but -nearly- painless with good posture
Logitech trackman: speedy and nearly as good as the 3M device if you prop it up at a 45 degree angle.
nitpick: I have a logitech trackman wheel at home and have to regularly pop the ball out and clean the contact bearings of gunk. Since that takes all of 5 seconds I'm not too sad to do it.