Being a PC user since...forever... I'd know better than to jump on a new OS until after it's blown a few places up and been fixed. Does the same apply for upgrading the OS on a Mac? If the new OS is out in September, does it make sense to buy now and upgrade or wait to get it shipped? Are Mac OS upgrades anywhere near as painful as PC? Will I be worrying about app or hardware compatibility issues? File loss? Hair loss?