As twitchy as this trackball is, I found myself ...

As twitchy as this trackball is, I found myself hovering my index finger above the ball when not actively moving the mouse pointer, which caused more tension in my hand a wrist and defeated the purpose of buying a trackball. Also, the position of the buttons and scroll wheel makes it more difficult to transition from using a traditional mouse. I returned this mouse and purchased the thumb controlled version.

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