Kensington TurboRing Trackball (PC/USB Mac)

Rating:
Summary: Almost perfect
Review: This is my first day using this nifty device and I really like it so far. That means a lot from someone who used a regular mouse for the past 15 years and finally decided on a trackball after my wrist started to hurt several weeks ago.
The shape fits very nicley in my hand and I don't need a wrist support to have a comfortable feel (I absolutely had to use one with the mouse).
I don't agree with previous comments that it requires excessive force to use the ball or ring. My only dilemma is to decide which finger to use for the trackball and which one to use for the ring. I'm sure it will take some time getting used to it.