For somethings it was great, and I had some weird stuff happen in renders, so I went back to SR2.1 which has been the most stable on my system. I had a crash and had to reinstall poser5 so that's when and why I went back to sr2.1, I only had a day or 2 to play with sr3 so I may have to give it more of a test period, but don't have time right now to beta it to see. I'd say if it works and you don't need the fixes of SR3, then wait, or install on different system if you can and play and be the judge yourself.