I am using one now. There is a compatibility problem with my 2940U2W. The 815 chipset temp is at 28C, which is 2C higher than my CPU's idle temp. Measured this using MBM5 and also a Digital Doc 5. Besides this 2 things , everything is cruising along just fine.
P3-700 cB0@975
P3-700 cC0 is on the way and thinking of acrtively cooling the 815 chipset