I actually had quite a pleasant experience with an Abit RMA. My BH6 up and fried itself this summer, and it was just barely over a year old. They said that they'd replace it no problem, even though it was technically no longer under warrantee (if even by only a week or two). I showed them the order from the online shop where I bought the board (along with a copy of the credit card bill where I was actually charged), and they waived the $25 RMA charge.
Heck, they accepted the order form as an invoice even though it actually said Bx6-2 (the shop screwed up and sent me a bh-6 by mistake, and I didn't want to go through the hassle to try to return everything).