Negative Positive
Title: Six months later, it decided to stop working.
Review: Purchased the unit in August of 2011. This past month, in January 2012, the left button began to lose sensitivity. It would no longer highlight text, grab and move files, etc. Pushing down hard on the button and moving it around would bring back a measure of competence--for less than a day. After which the problem would repeat.I checked out the Logitech forums, and discovered that this issue is not at all uncommon with this particular trackball. Various users have even listed the many attempted remedies they've applied, without success. All agree that the only sure cure is getting a replacement.Which is what I've asked for, now. We'll see. In the meantime, I can laud this trackball for its performance...when it works. A shape some flaw in its design or manufacture causes a number of them to cease working, after a time. At least it's still under warranty.
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