After the holidays I will probably be going from a 160GB 5400rpm drive in my Macbook Pro to a 320GB 7200rpm drive (granted that I don't screw up the installation and make a giant paperweight of my laptop). I've been rolling comfortably on 10.4 ever since I got it, doing mostly design work in CS3 and net-surfing. I've been planning on waiting for 10.6 to upgrade, but since it may not come out until after I've graduated college (and me therefore no longer eligible for a student discount), I'm considering just jumping into 10.5 now since I'm assuming it's gotten more stable by now. I can see Time Machine being easier to use than my manual backups, but is it really any better than SuperDuper? And do most programs run alright on it? I've run into virtually no applications that require Leopard. Any arguments for or against? And please, no "OMG LEOPARD SO GREAT I'M JUST SAYING THIS BECAUSE IT WAS INSTALLED ON MY COMPUTER", I'd prefer to hear from people who have actually upgraded.