The G402 is quite nice, though, and I would now recommend one over a G400s, except for the few users that regularly go over 4m/s (it switches to the gyro around 2.5m/s, it seems, which is fine for short twitchy movements, but maybe not for longer motions). While it only has more buttons in a cosmetic sense (3 are unreachable, without a full palm grip), going back to grippy sides alone makes it better than the G400 mice. The grip isn't identical, but close, I'm getting used to it, and it loves my cloth pad (Allsop). I just wish they gave more usable buttons, like the MX518, G400, or even G502 (but without the weights, wide thumb lip, higher back, and bad scroll wheel--IBM made a mouse with a 4-way or 5-way stick many years ago, and it was very nice to use, unlike tilt wheels).