First off, why didn't you review the BD133u which is the Tualatin version? (Hey I know, if it's free don't ask questions)
My story is very similar, BE6-2 that always gave me problems and finally crapped out (F Abit), bought a BD133u. The first one they sent me would not even give me a video signal so I sent it back. The replacement is running good but my complaint is with the BIOS/ram settings. The only options are 100/133/by SPD. Even RAM rated at 150cas2 is programmed (SPD) to 133 which means even if your fsb is set to 150, your ram lags behind at 133. It even sez it in bold letters across the BIOS post screen "Main Memory is 133Mhz" I've emailed Iwill about this but no reponse. Hopefully they will give more ram options in future BIOS. Last BIOS was August 9th, 2001 although the 815 is an old/outdated platform so I'm not holding my breathe. Pass it along to Sherman for me. As far as o/c goes...
BE6-2 v1.0 POS P3-650@845 (130fsb)
BD133u P3-650@955 (147fsb)
Why your brothers works @900, I can't say?
Your Iwill link on page 6 is misspelled.