Title: Buttons about 1" too far back - you must bend your thumb!
Product review: Microsoft should really take a lesson from Logitech here. I tried the Trackball Explorer as a replacement for my WELL worn Logitech Marble-Man FX (discontinued - though I'll never understand why.) My hands are M/L - totally typical.After 1 hour of use, my thumb was killing me. You see, you must reach BACK to far to hit the thumb button. If you compare it to logitech, you'll see that they have the buttons in-line with the ball or just under where your thumb falls naturally, meaning you can click on them without bending your thumb at all.The mouse is accurate, and the ball feels nice, but you have to use those buttons... and they are awful. If they'd move them forward about 1" this would work as well as the Logitech MarbleMan FX does.It's no wonder those things are going for $150 USED on Ebay... Logitech had it right and nobody has yet repeated it.
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