I have been using the 2011 MBA 13 for a few days now and I miss the 2010. Battery life is at least 50% worse than my undervolted 2010, browsing for 30 minutes (no flash) on 30% brightness uses 10% battery! The 2010 would have been 5% max. I am trying to decide if I really need the new cpu or the backlit keyboard that I upgraded for. I'm not keen on the reduced gpu performance either, hopefully it won't be too bad with Diablo 3. Is the new model drawing more power or is Lion the reason?