I'll be honest, when I first installed the GM edition of Lion, I hated it. With a passion. It seemed slow and sluggish compared to SL, with my fans working more than usual, and RAM usage being alot higher. I tried extensively to downgrade to SL, heck, I was even prepared to sacrifice years of files to go back to old Snowy. Then, after about 3 days, those thoughts went. Lion, and all it's new additions, just take alot of getting used to. Sure, it was nice having Expose and Spaces as separate apps in SL, but if you remember the efficiency of them, Mission Control is a whole lot better. Instead of flicking through your spaces, gesturing or keying to launch expose to find what you're running, all one has to do now is press a single key, and everything is presented, in a neat, organised way. Resume is also another awesome feature. I guess all I'm trying to say in this very badly structured argument, is that you should give Lion a chance. It grows on you... P.S. I'm running Lion on a MacBook Pro Mid 2009, with a 2.26GHZ and 2GB RAM. I intend to upgrade to 4, possibly 8, but Lion still feels alot more efficient and generally quicker than SL did.