Regarding response, I bought one at Staples last year and love it. But once in a while (every couple months), I catch interference from something, because it lags several seconds behind. It usually only lasts a couple minutes. But a coworker bought the same one and wasn't able to use it in her cube because of the interference. No idea what was causing it, though, as I thought they were on a fairly unique frequency.
Nonetheless, I want to replace my Logitech at home with this, so thanks to the OP. Best mouse I've ever used. The side buttons are perfect. Just wish I could load the driver to get the side scrolling, but it overrides the Dell touchpad driver, which I need when I'm mouseless. :-(