If you are doing HD then the 64 bit versions seem to be much more stable. Having been in software development at one point, I can tell you that what you don’t see is likely the cleanup and advancement of 64 bit code within the product. We are now two versions deep in 64 bit Vegas, I think, and also a much improved 64 bit version of Windows and .NET (which I think is used in Vegas. All in all, stability ought to be much improved, and it seems to be for me. It still occasionally crashes, (happened yesterday for instance and I didn’t lose anywork) but I can go a long time without it happening. So I usually upgrade rather rapidly, letting a few months go by to see about whether their are issues that surface, doing some homework on plug ins, then jumping in. I’ll likely upgrade in December or January.
And yes, hard drives can fail out of box. Always back up the system.
Alf