I picked up an 8IEXP today, with a P4 1.8A, and my god it runs nicely.
I can't really back that up though cause I haven't run an OS on it yet - I forgot to recompile my linux kernel with P4 support (nice one Ben), cause my last system was an Athlon one, and I didn't realy feel like installing Win2K.
However, just to try it out, I clocked the bus at 133 (that pushes the 1.8 to 2.4) and it POSTed, BIOSed and ran my bootloader perfectly. I didn't overvolt it at all (the voltage was actually at only 1.49) and the RAM (KingMax PC2700) was at 354 (FSB X 2.66) and it was all sweet, at least for what I was doing. It'll certainly be interesting to see if it gets to windows, and is stable, without upping the voltage or pulling the RAM back.
But so far it looks good - I'll post more around these forums when I've had a chance to get Linux/Win2K up and running.