Running my BX6 rev 1 with a Celeron 2 566 @ 850. Can't remember how much I bumped the voltage (think 1.8? gotta look, been ages since I messed with it). It is stable, has golden orb for cooler, no problems.
Only thing I don't like about this board is the additional IDE chip (highpoint 366) makes setting up other OSes a pain (linux, etc). Also the AGP is 2x and I've got a Geforce2 MX so I'm thinking of upgrading it to get 4x AGP. Not sure how much of a difference it makes...