I've dealt with biostar's rma process, and it was ok. But they almost always refuse to pay rebates unless you make copies of your forms and remind them after 12 weeks. I won some boards from asrock years ago; they worked fine. Most on this forum would recommend the asrock, but I still like my amd biostar 880 board.
I already purchased a board this one it is a asrock and seems to have a plethora of features for the price. The only downside i see is it has one pci slot so i can't sli but that isn't going to be a problem for me.