It was a combination of wrist pain and seeking the ideal mouse for a left-handed person that led me to the Logitech Optical Marble Mouse.
I was convinced this is the mouse for me when I read that both left and right-handed folks can use it. Most of the trackball-type mouses are for right-handed individuals only. And to have a mouse that is stationary is the perfect feature for my little workspace.
It only took me moments to adapt to the style and function and am currently pain-free when it comes to my wrist.
I still have my Kensington mouse which makes a great travel companion to my laptop.
I've got to hand it to technology. I honestly don't know where I'd be without it.