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Title: Not ergonomic
Review: I bought this mouse at Best Buy - actually for less than what Amazon was selling it. Go figure. It was the only trackball they had. It was to replace my beloved Logitech Trackman Marble Mouse - the one with the ball in the middle in which you use your index finger to rotate the ball, not your thumb, like this one.While I've always thought the thumb quite an anatomical achievement in human evolution, it still does not have the steadiness and dexterity of the index finger and therein lied the frustration and inability to control the mouse's direction on the page in the effortless way I was able to when using my index finger. I felt like I had nervous disorder when using this mouse as it does not have the accurate movability for me when using my thumb.I know this mouse got great reviews, that's why it was purchased. But it turned out to be ergonomically inferior to my previous trackball. Others apparently love it so I know I'm in the minority here of disappointed users.
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