I had one in my rig for a couple of days. Not a bad Athlon board. It overclocked better than an A7V266-E, KK266-R, and A7V133 I tried, with a TB and XP.
Mine was a little quirky, though. Would only run stable with optimal setting in BIOS. If I tried to manually adjust CAS settings, wouldn't run stable. Also another bug is the + voltage option in the BIOS does not work correctly. Only one of the + overvolt settings work, the others are dead. And you can only get around 1.85 max VCORE in the board. Thus I could only get around 140-150 FSB on both CPUs. I plan on volt modding to get 1.9, which should help.
Haven't kept up with the AK31a scene so not sure BIOS updates have fixed the problems. Check out the Shuttle section in the AMDMB.com forum.