I traded my 17" Powerbook for 15" Mac Book Air when they came out over a year ago. 500gb and 8 mb. Use a 24" display at home. Would never trade back. Easy to travel with and big enough screen (for me). Rarely load programs and Superdrive usually stays home reducing weight. Only complaint is Thunderbolt used for display so I use wireless at home instead of ethernet. Bought 4 port usb hub for u/$10 at Newegg.