My friend is buying a MacBook this summer and is planning on taking advantage of the Back to School promo. He is working to save up the money for it, but is afraid that the upgrade will happen before he's saved up enough. He would rather get the current model than end up with a potentially glitchy new version. How quickly should he make the purchase? He was going to wait until August, but now that seems like it might be a little too late. Thanks! Sorry... this must be the 9 millionth post on when to buy!