Beta vs WHQL
I tend to not update drivers unless there's a definite benefit. All my rigs have 3 or 4 GPUs and it's just a pain to update them, get them all extended again for folding etc. If there are listed fixes that benefit a game I play or folding on a Beta, then I'll give them a try. If not, I just roll along until something I need is listed. I've never really been bit by a Beta Driver for GPUs, but again, I rarely bother to try them.