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Title: Expert Mouse didn't suit me
Review: The "Kensington Expert Mouse Optical USB Trackball for PC or Mac 64325" didn't work for me. I wanted to upgrade from my trusty old trackball to one with a scroll wheel. The first Kensington trackball I received was defective; the scroll ring travelled very roughly, like there was sand in the bearings. After a call to Kensington customer support, where the support rep confirmed that the device shouldn't act like that, I returned it to Amazon and received a new one. Unfortunately, this device really didn't act much better. The scroll ring still operated quite roughly. But most of all, I found the action of operating the scroll ring very counter-intuitive and awkward. The near-horizontal rotating motion of the scroll wheel became painful for my wrist. I had to return the device.
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