It just got delivered at my work (Last day) so I plugged it in. Initial impressions are:

Good
******
- Shape is cool, it's nice to touch
- Buttons feel excellent and are very responsive
- Scroll wheel is lovely (I'm used to the ms3.0)
- The 1000hz switch is very cool
- I can see the DPI switch being useful.
- 450dpi tracks flawlessly (on a very bad mousepad)

Bad
*****
- Look at the picture below, guess which DPI is what (3 dpi settings, one of the DPI settings I lowered my sens and tried again)



UPDATE: It runs much... much... better on my QCK Heavy. It's actually playable now and I can tell that my aim is going to shoot through the roof with this. HOWEVER, how the hell do I get rid of the frikking lift off? Tap over the sensor?