I wish that I'd waited and although the features in P6 are very attractive - the aggravation factor is very high too!
I had no real problems with P5 and may return to using that until P6 is repaired. If you bought a new car or TV and it stopped working every five minutes you'd demand immediate action to fix the problem and wonder how the heck it got by quality control like that. Software users are doing the job of unpaid beta testers and are paying out their hard-earned cash for a less than perfect product. I find it immpossible to believe that this memory problem was not discovered during testing and if it wasn't then they need better testers. If it was a known problem, they should not have released it until it was fixed.
Of course it's not easy to test software for every graphics card, motherboard or system configuration but in my humble opinion P6 was rushed out to get in some fast cash.
When/if it is fixed properly, it will be a superb tool but until then I will continue to regret buying it.
Sorry if I sound fed up with it, it's because I've been trying to get it to render a fairly basic scene all night and the damn thing just hangs all the time :(