I just bought a 27" iMac. Love it. I've been using Mac OS since 2000 or so (whenever the blue/grey G4 came out). In my opinion, Snow Leopard is 10/10 while Lion is 7/10. 1. Will my new iMac work with an old OS? (driver issues, etc.) 2. If I did downgrade, what do you suppose would be the long term implications? Two years from now there will be no more patches and I;; be forced into 10.9 or something? I don't like the way the Mac OS is headed.