M8H user for about 4 months.
Positives:
Great board, awesome fan control with plenty fan headers, great OCer, nice looks, stable and so far reliable, plenty of VRM power, cool AI Suite III software (not sure why it does not work on some setups), great BIOS with any tweaking you can think of.
Negatives:
Popping on board sound issue (which I don't think it will ever get fixed), PHC light control not available in BIOS, no dual LAN
So far, the experience I've had with this board is awesome. The positives far outweighs the negatives and if ASUS ever finds a way to eliminate the popping sound issue, I would recommend it to anyone.