Trackballin
For a while I used to have a thumb trackball in uni. Some Logitech. Made it easy to do 3 button mouse CAD work on the go. Went through a couple for not-main machine use. I played TF2, a few other FPS games, and MMOS so I used a gaming mouse for a while. I got a Kensington with a big orb on the cheap and used it on and off. I've been using it again with a laptop and I think I've come to the conclusion it puts my wrist in too weird of a position for my desk(s). It kinda tilts my hand up a little bit and when the desk is lower that angle is a little harsher on my wrists. At jorb it worked ok because the desk was high relative to elbow so it kinda worked. I can see why people prefer more flat ones. May go back to thumb trackball but spinning huge ball to make mouse move is kinda fun.