I\'ve been using/administering *nix (BSD, BSDi, Solaris, RH) for about 7 years now. I recently, well about 6 months ago got a 17\" Powerbook and I tell you, OS X kicks ass. It\'s basically pure BSD on the backend with a lovely UI. It\'s a fine OS. Sure it\'s pretty but behind it all it\'s got the grunt you need.
My brand new SL-5600 comes in the mail on Tuesday. Can\'t wait.