Just a heads-up for anyone who took an interest in this mouse after I mentioned it:
I felt like the 16400 mode was a bit swimmy/floaty. It doesn't matter much in windows, since you'd never use it, but for XIM I expect to have the DPI cranked up. So I went to teh intarnets to learn more...
The sensor in this is apparently the Avago ADNS-9800. I found the datasheet, which surprisingly includes the programming API (well, the hardware registers). The sensor's DPI can be set anywhere from 200 to its native res of 8200, in steps of 200. So the 16400 DPI mode is just interpolation/extrapolation trickery in the mouse's firmware, and that explains why it feels different from the other modes.
Luckily, the utility lets you set all 5 DPIs for each of the 5 profiles stored on the mouse, so you can eliminate the fake mode pretty easily. You can even disable modes entirely, so that e.g. you could use one button to toggle between two modes instead of two buttons to move forward and back through five.
Also, as an aside, the utility has an option for setting on-board acceleration, so you aren't forced to use it, but you can if you like. On a similar note, there's no setting for axis snapping, but I don't feel like there's any snapping anyway, so that's okay.
</nerd>
( ... ha ha, not really: the nerd element cannot be closed.)
