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Title: Wonderful except ball falls out too easily
Review: I've used Logitech thumb trackballs since about 1999. As the other reviewers have said, it has saved my hand and arm from great pain. I own about 4 of the Trackman Marble Wheels (discontinued) and now one of these. Everything about it is perfect, EXCEPT that the ball pops right out of the top every time you drop it or even if it just gets turned over while moving (in a laptop case for example). I wish Logitech had made the ball just a little more snug or put a ring around it like on the old Trackman.
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