This mouse is fine. It kept slipping out from under my thumb and ring finger as I moved, so I had to shave a piece of plastic off the grip area to create more notch. I then used a file to lightly texture the plastic around the indentation I made to give it a better grip. I have no idea why it wasn't designed that way from the start. Without modification, the sides fall almost straight down, with a slight concave concavity. This, combined with the slick surface you hold the mouse on when you pick it up and move it around, makes it difficult to hold. I'm considering buying another one for my other laptop, but I don't like the idea of making these changes again. As far as battery life goes, I have no complaints. I've been using the mouse almost continuously for 8 months and haven't had to change the battery yet.
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