I swear by my trackball mouse. You don't have to move your arm around. I start having pain in my wrist using a regular mouse, due to the compound fracture I had a few years ago.
I bought one for work and home, and if I have to use someone else's computer the slidey mouse drives me bonkers.
Of course, it's fun to watch someone try to use my computer. They try to move the base of the mouse around.
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