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Title: Very disappointed
Review: My Kensington Expert Mouse (of the previous generation) finally bit the dust and Kensington was nice enough to give me a replacement - only since they didn't make the Expert Mouse Pro (64213) anymore, they sent this one, which replaced it. I hate it. It KILLS my hand, which suffers from RSI. I had no problem with the previous version. I blame it on being optical. Sure, less moving parts, but they move so weirdly. No matter what setting I used (you can change speed, etc. with Kensington's Mouse Works software), it still was like pushing that trackball through molasses. Didn't feel responsive. Plus, they got rid of the extra 6 macro keys that were handy for launching my favorite apps. Still searching for a good trackball that won't kill my hands. Now I'm wary of all "optical" ones.
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