I also checked out the new MacBooks over the weekend. I agree they are great machines, and in some ways I feel like ditching my MacBook Pro to get one. The performance for development purposes should be just about as good. If the whine had been fixed, it might be a home run. I'm really bummed that there are so many great things about these machines that, to my mind, are dragged down in the mud by the persistence of the whine problems.