First question: Is there a benefit to erasing your HD before installing 10.3 opposed to doing an install ontop of a previous version? Or did I misread something a while back? I have a friend that complains of random quirks in 10.3, but refuses to do a clean install. He doesn't want to lose program preferences, or need to reinstall any programs. Doesn't his home directory hold all the data needed to do this? If he were to simply back up his home folder and applications folder, when moved onto the fresh install, would they be fully functional, etc. ? How can he achieve a clean, bug-free install without losing a single prefence?