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Pros: Works nicely when it works. Proper shape, pretty good ball motion.
Cons: Terrible quality. I have owned 4 units now and the middle mouse (roller) click function has failed on 3 within a year. Ball bearings for the ball collect dirt much faster than the old MS trackballs seem to. Will not survive long with 10+ hour workdays.
Other Thoughts: sadly its still probably the best mainstream available trackball on the market.