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Title: Kensington Expert Mouse (Trackball)
Review: I had read that after about a year the scroll ring starts having problems. I found this to be true for mine as well, so this is my second unit. I completely disassembled my old one and tried to repair it, but there was nothing obviously wrong. Tweaking components in the optical path of the scroll ring helped, but didn't get it running fully again (sigh). This new unit worked perfectly out-of-the-box. It gets good use, and it helps keep my wrist from aching (problem with regular meese), so overall, it's quite worth it (we'll see how long this one works for).
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