I've had P5 since the beginning (I was a preorder). I had a few problems before SR1 but haven't had any major ones since SR2. And I must say that the technical staff at CL promptly replied to my request for help with a variety of possibly solutions. Most of the problems were more to do with WindowsME than with P5. I have pictures that won't render due to needing too much memory but I had the same problems with P4 and P4/PP. I admit that I haven't used most of the extra features much but I absolutely love being able to have separate Runtime and nested folders. I haven't used P4 since SR1 came out.