I had PR4's for 10k miles and loved them dry and wet, but hated them on any kind of gravel or fireroad. If you ride enough you're going to hit those, so I updated to Roadsmart III instead of PR5. They went through a highway thunderstorm ok and I can confirm handle better on dirt, but aren't a real 80/20 tire. The real difference I feel compared to PR4 is how they lean in and hold lines easier in turns. That was disconcerting at first because you've got to keep light pressure with PR4's, but now I like them better in twisties.