After testing this out for 48 hours now, the new 1.3 BIOS is a vast improvement on the old one. I think the ability to disable C1E is the key to the improved overclocking with both quad-cores and dual-cores. The Q6600 that was previously stuck at 3.3-3.4GHz is now running quite happily at 3.6GHz and my E2180 that previously wouldn't move over 2.66GHz is now running very happily at 3.5GHz in the same board.
The RAM dividers are also much improved now - you actually get what you dial in. As Pauly B said - this is now a very good value board compared to most of the other P35 boards out there. It's just a shame we had to go through the V1.2 BIOS to get here.
I actually recommended this board to 3 people on here yesterday - not something I have ever done before.
Credit where it's due - J&W listened, and rewrote the BIOS very quickly - I'm looking forward to the X38 board now.