I'm a beta-tester and I can tell you that Apple pretty much ignore the vast majority of the bugs I've ever posted (which is kind of depressing) and mostly focus on the really bad stuff (of which there's usually plenty). It's the right strategy given the hand we're dealt. Over the years I've come to the conclusion that as Apple have grown into a behemoth company they, just like Microsoft, now have significantly lower software quality capability and have left it for the rest of the world find many of the bugs. Back in the early days Apple never made public betas of anything, now it's a time and cost savings strategy for them. If you're looking for a seamless smooth ride or some polish and attention to detail in a new OS X release then I advise you wait until about the n.4 or n.5 release (and don't put 50% of the blame on the beta-testers!).