You can add you old P4 runtime to your new P6, so you don't have to reinstall everything to p6 separetly. As for the interface; it is more complicated, but you'll get used to it. It's just one of those tradeoffs I think :| More options, more complicated. And the new firefly engine is nice. Is it worth it? I suppose so, alltho P6 is incredibly slow on my machine like 3 times slower than p5.. Odd. I haven't used p6 much because of this but perhaps others have more positive things to say. And perhaps it will run just fine on your machine. :D

-Morbo will now introduce the candidates - Puny Human Number One, Puny Human Number Two, and Morbo's good friend Richard Nixon.
-Life can be hilariously cruel