My computer experience was still mouse centric at that time, so I really didn't appreciate the elegance of this Trackball.
First of all, don't let the price scare you. Its worth the $100. I found the gigantic trackball perfectly sized for the 3 monitors I have on my workstation. The thing I love the most that you can't get on any other device is the ring around the ball. It acts like a mouse's middle wheel, except its a giant ring. When I say giant, I mean 3 inches. Compare that to Logitech's 1 1/2'' ball.
If you are a trackball fan as I am, the Kensington Expert Mouse is the way to go!
