For many people different mice feel different.
Bullveyr from ESR, right? And this is very true.
I own a WMO, Deathadder, MX518 and IME3, all mice have their unique feel, and i'm not talking about the build of these mice, I'm talking about the ways that the sensors feel while tracking. Respectivley, the WMO, and the IME3 use the same senors, (no prediction, but low m/s) but I do love the shape of my IME3 the shape of the WMO is ok, but I have larger hands, and hence prefer the IME3
The deathadder is by far one of the best mice I have used, because of the supreme smoothness of the sensor on my mousepad and the 518 is not too shabby either, although shape is pretty bad imho (the deathadder imho is too heavy, but still like to use it for ET/RTCW), and so my sister is using my G11, and my MX518, i'm such a nice sibling. I want to try a trackball out in the near future, but haven't got round to it yet.