A word on Mionix mice:
Positive points for both Naos 7000 and 8200
*The (identical) shape of both models is absolutely amazing/wonderful. It feels molded to my hand.
*Clicking on on both is solid and satisfying, neither too sensitive nor too difficult.
*Excellent quasi-rubberized surface that strikes the perfect balance between grippy-ness and smoothness.
Regarding the sensors in the 8200:
*Poor. Prone to random acceleration / pixel-skipping, making for imprecise pointing.
*My 8200 also tended to just wig out and go crazy every once in awhile, with the DPI dipping down to almost nothing for no apparent reason.
Regarding the sensor in the 7000:
*AWESOME. No pixel-skipping EVER (okay, well, maybe if you go up into the REALLY high DPI ranges like 5000, but I know no one who actually uses those settings). You're getting totally raw responsiveness. What your hand does is exactly what the pointer is going to do.
More great stuff about the 7000 specifically:
*Adjustable lift-off distance.
The only negative thing about the 7000 that I can think of:
*They removed the DPI indicator lights they had on the 8200. These are the only lights I used on the 8200, and I miss them a little, but not a big loss at all.
Overall: get the 7000. It's basically the perfect mouse in my book. The sensor is so much better than the 3200/5000/8200, it's just not a contest at all. Stay away from the 8200 series, get the 7000.