Title: Trackball doesn't track!
Product review: I used the MS trackball optical for about a month. I just put it back in the box. My thumb hurts because the curser/pointer is moved only by your thumb. Even worse---the ball moves the pointer very sporatically. Sometimes, I'll roll the ball up or down and nothing happens. Save your money and buy a logitech "Marble Mouse" (I use it on my other computer). It cost about the same, doesn't hurt you hand, and actually moves the pointer where you want it to!
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