ASRocks higher end stuff seems to be pretty solid granted i have no statistics on brand fail rate.
A few years back ASRock seemed to be fairly shunned by the enthusiast community, but today they seem more of a player in the higher end segment then they used to be. Granted, the lean is still towards brands like Asus, EVGA, Gigabyte and even MSI in the higher end segment, but overall the higher end boards from ASRock do seem like a good choice. The ASRock OC Formula looks like a very top quality board, so i wouldn't worry. If it has the feature sets you want, i'd go for it.