I have been using PF and its predecessor for several years and I am yet to witness my first crash on my Power G3, G4. or G5. It blows my mind when I read of someone suffering a crash that could be attributed to PF. I must admit there are occasions where the Finder does rear its ugly head, but a simple click anywhere on the desktop resolves that instantly. And, yes, there's an occasional problem emptying the trash but that's about it. Most reliable and useful software I own.