Title: Useless trackball
Product review: This trackball is virtually useless. The ball's friction is so bad that it is impossible to control the cursor accurately and smoothly. Also, the software that came with the device did not enable the advertized features (using Windows XP). So, although the concept is good (the extra 2 buttons, for forward and back, are a great idea), the implementation is so bad that it defeats the utility. The Logitech trackball is orders of magnitude better.
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