I have both P4/pro pack and P5 and use both. 1. Get rid of P3 and go to either P4 or P5 2. Yes, everything that works in P4 works in P5 3. No, the crap you heard about bugs is pretty much resolved with SR 2.1, especially if you have Win2k. 4. What's the price between P4/PP and P5? I bet you find P5 cheaper now. If so, go for it. 5. P4 was never fixed so why should you think P5 would ever be fixed? 6. There are only two advantages to P4/PP over P5. The first is the plugin with LW and if you don't know what that is, then you don't need it. The second is that on some slower computers, P4 is a bit faster to work with for basic things. If you have a decent modern system, then go for P5. Ok, that's my 2 cents. I got P5 on the pre release and never had a single bug (er, well, almost never). I went through all the service packs and never had a single problem after the first one. I can say that there were some work arounds that I had to do with the basic proggy that were solved with the first service release. I can also say that I've heard some complain about existing bugs in the animation portion. I can also say that 90% of the current rumor about P5 is attributed to hatemail, or frustration at the new learning curve (P5 is way different from P3 and P4). I don't regret buying P5. I use both. P4 to start the scene and P5 for finalization and render.