Wheel Mouse Optical 1.1a.

there was a thread about this and a few people bought it and posted their thoughts. id post a link if i could actually find the search button on this forum

was just at best buy and held this mouse.. actually very comfortable and the sides are made of very grippy rubber so its easy to lift up. The scroll wheel doesnt click though and I'm not to sure about the sensor. Also, only 29.99 for the corded version... I almost bought it.

Mouse Tracking System
Microsoft-proprietary BlueTrack™ Technology
Imaging Rate
Dynamically adaptable to 8000 frames per second
X-Y Resolution
1000 points per inch (39.4 points per millimeter)
Tracking Speed
Up to 72 inches (1829 millimeters) per second
Maximum Acceleration
28G

1.8m/s max tracking sounds good, now if sensor placement and lift-off distance is good too this is a potential gaming mouse

http://www.esreality.com/?a=post&id=1867986

Oh yeah, I knew I had seen a pic of the 4500's weird sensor placement somewhere. Too bad m$, you have lost your magic :<