I just read on another thread that the 15" MBP is similar in size and footprint to the 13" MBA. Is that right? I ordered a 13" MBP with TB, but think I'm going to return it because battery life is very important to me. I was going to replace with a non-TB 13", but then heard that the 15" is pretty similar in size to a 2013 Macbook Air, which is what I have now. Since the 15" battery life seems to be pretty decent (over 10 hours from what I've read, which is enough for me), I'm thinking about getting a 15" instead. Anyone out there with a 2013 MBA and a new 15"?