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Title: Excellent (with a little reservation because of friction)
Review: I own 2 Kensington Expert Optical trackballs. I've had the previous generations too. The optical version is very convenient since it does not need constant cleaning to remain operational. Needless to say, I like the trackball a lot! I've set the upper buttons to copy and paste and it saves on the common stressful multi-key operations.My one complaint is the one I have at the office is starting to roll with more friction. Even after cleaning the ball and the 3 small supports in the casing. I'm not talking about the initial friction that people experience with the product in the first few hours. That office trackball is about 1 year old with 40 hr/wk of heavy software developer use. The one I have at home is newer, less use, and glides much easier.
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