I was a trackball guy years ago- back when mouse balls were always dirty and cords would get tangled. Then came the wireless optical mice and a scroll wheel that does up/down and sideways. Side-scrolling in a music or video program is really nice. It also has buttons that do forward/back in the web browser.
I notice people that complain about the mouse usually have it set to the stock sensitivity and move their arm and wrist all around their mouse pad. I set mine pretty high so I barely even need to move my wrist- mostly just fingers.
Legacy Forum Post
If you ever converted to a trackball from a mouse, and stuck with it, what about it did you like most? I'm sure the whole not needing extra desk space is nice - anything else?