Title: Save your thumb...
Product review: I've used a trackball for over a dozen years, and when this came out I bought one and was very happy with it. After +/- five years, it became jumpy, so I decided to replace it. After searching and trying, I ended up with another of the same... or so I thought.The replacement had a ball that would barely move. After cleaning and trying it (to see if the plastic might 'loosen up'), I returned it for a replacement. After using the replacement Trackball Optical for 6 weeks (after the return policy expired), I've given up. The ball movement has continuously deteriorated, to the point where if it's used for 30 minutes your thumb won't work. It sure looks to me like this is a closeout, given the price drop, and it's not worth any amount - don't let them PAY YOU to take it, you'll thank yourself by getting something else.Another Microsoft hardware product that couldn't make it.
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