Ergonomic and everything!

I started having some wrist issues at work and went to purchase a trackball mouse. I found this Logitech mouse, on sale, at Office Max for $20 and got it.

User-Friendly
The mouse was a great choice, and one of the few ones in the store that had Mac compatible cords with it. I just took it out of the box and plugged it right into my keyboard and I was ready to go. No complicated stuff with mice.

Click and Scroll
The trackball is much better for your wrist and ergonomically safer. It is stationary, so you just use a finger (any one, pick one!) to roll the ball, rather than using your entire hand to roll the actual mouse. The ball and the buttons are very large, making them easy to use. Its easy to clean, the ball comes off the mouse with a little effort -- nothing like the regular mouse where you have to turn and then remove the ball to clean it and the rollers inside the mouse.

Comparison Shopping
I found this trackball a bit less comfortable than trackballs where the ball is positioned to support your palm (this trackball is at the top of the mouse, and more where your fingers rest) but for the price its great. It only took me awhile to get used to it, and since I haven't noticed any problems. Plus, I haven't seen any other trackballs for this price, and Logitech is a trusted name in computer gear so its worth it.