I am trying to decide and have been to both Apple Store and Best Buy. Here are my observations: - the 11" is really a true laptop in a small package, nice and very tempting! - Battery time is pretty much roughly one hour less than the 13" regardless if it is under load or just browsing. - The 13" has the SD card reader so in theory (please correct me if I am wrong here) it can be used as an additional 32Gig storage for media files like iTunes etc. - It is a little harder to read text on the 11" but it is really sharp none the less. - Keyboard and mousepad is pretty much equal - Couldn't see any difference in screens, both had the Samsung screens at BB Resolution wise the 11" is pretty much equal to the 13" MBP give or take a few pixels while the 13" MBA is equal to the 15" MBP. Btw, the 13" MBP gave about 3 additional hours of browsing compared to the MBA when I tested them but the glass screen and weight is not worth it...! I am getting either 11 or 13. I have the rev B 13 inch and really like it but the heat on it and the vents under the laptop really makes it hard to use. Looking forward to this rev E instead with about 2+ extra hours of usage compared to mine. Even so I was very lucky with mine and got one of the really few excellent screens when I ordered mine from Amazon at that time (2009). My wife has already reserved it.... What surprised me is that this time it is possible to chose the 11" without any sacrifice in performance. I am torn between the 11" 1.6 with 128G or the base 13". $100 in difference. Btw, Best Buy has a sale right now and it was only 1134 for the 11" there but since I have gift cards at Amazon it will be ordered from there. The main question is if the screen is too small in the long run on 11" and if it will strain the eyes after a while. On an airplane it would be perfect but I will use it less than 5% on airplanes so that is not really a deciding factor. I am definitely leaning toward the 13" but the size/weight of the 11" in my view gives it the same portability as an iPad and makes it very tempting! Any insight or comment?