What's the point of doing a clean install if you want your things to stay exactly the same. There's really no point. It being safer? In your dreams. If you're gonna get bugs, it won't matter whether you clean installed or upgraded. A clean install is only a long detour. Updating will get you from point A to B the fastest while doing the least amount of work and worrying. I think people who convince others to do a "clean install" would rather complicate things for others to make themselves feel smart. Take this from an average computer user who recently upgraded. EDIT: You may have to uninstall Unsanity (very few will have this problem), but that's only 1 step.