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Title: Tendonitis causer
Review: First off I think this mouse looks great, which is why I bought it, but it is a horrible product. Within a half hour of using it I had shooting pains going up my arm. I had gotten tendonitis about a year ago which I was able to trace to the use of a different "ergonomic" microsoft mouse. It hurt for a long time but had pretty much gone away until I tried this ms mouse. After about a half hour I had pretty severe shooting pains. I think that it was mostly caused by how hard it is to push the buttons on it unless your fingertips are at the end of the buttons on the front of the mouse. I returned it yesterday and got a Logitech Lazer V450, which is a fantastic mouse.
