Title: Good enough, bought it for 50us$!, now retailing for much more!
Product review: Very ergonomic design, the best pointing device design i have ever used. Gets dirty easily, needs to be cleaned once a week (inmidiat removal of the trackball just by pushing it). No more wrist pain. The only concern is you feel the materials are very cheap. Bought it for just us$50 new, outside the us!, now retailing for 150!, incredible.
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