I think the majority of units are fine. Crashing due to anything to do with the hardware will be covered by warrenty, so just make sure you use it lots so any problem will show up sooner rather than later Obviously don't overclock or do anything that would void warranty though.
The problem isn't limited to Sapphire - a friend's Asus had exactly the same overheating VRM problems, but given the numbers these probably sold in I think only a small % have problems (though it's still a higher % than normal).