I built my system on it last night and are just finishing it off.
Provided you install the latest BIOS (thats not on the Abit site

) from the start, it was a totaly hassle free experience for me. Its worked perfectly, and the build quality feels good (although id reapply the thermal paste on the southbridge - see my thread in the Abit forum).
I wont overclock it much at the moment, because its only got a standard NorthQ HSF on it. Water goes in soon, which is where the fun will start