I have had one running for three days now. No Buzz, quiet, runs well.
I am powering it with a BFG 1 KW PSU.
The CPU is a QX6700, 2 Gb Corsair Dominator PC28500, BFG 8800GTX-OC
I am just starting to play with overclock, so far it seems to be a stable, high quality well built motherboard...