This trackball works flawlessly. It is quite ergonomic, which is important for me given the time I spend on a keyboard. The optical tracking makes it very robust, especially compared with standard trackballs where any hand oils transferred to the ball (easy to do) cause the ball to skip. This product is quite low cost, works great, and (in silver color) is quite stylish! Can't beat that combo! Only complaint I have is that the ball can come out easier than other trackballs I've owned (Kensington Orbit). But so far that has never been a problem in use.
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