Mionix Castor Review @ Vortez
 

Its defining points are in its ergonomics, shaped for all grip types, and is then finished with a top quality 4-layer rubberised coating, with textured rubber side grips. The renowned PMW-3310 optical sensor provides a raw, zero acceleration performance that has a doubled-up resolution for a lofty 10,000 DPI. Inside, you will also find a 32bit ARM MCU, 128 kb memory, OMRON switches and everything else that you could expect from a high grade gaming mouse.

http://www.vortez.net/review.php?id=1186