I'm trying to decide between the 13" MBA and 13" rMBP, and for me it simply boils down to retina vs. extra battery life. The other differences/factors don't matter to me. I've been to the Apple Store to compare the displays, but that's 20 minutes in a single lighting environment. The extra battery life of the MBA really appeals because I'm going to be traveling a lot next year, but I'm worried that I'll miss the retina display. I'm particularly interested in hearing from folks that have used both extensively. Thanks!