so here's my background: mainly I use my MBP for programming (xcode, coda2, unity, edge animate, etc) , video / audio editing, and graphic design. and I used to own 13" MBPs (of various generations). I loved the 13" for the portability, yet I was mostly working from home, and had my MBP hooked up to an external monitor like 95% of the time. then the time came for an upgrade, and I went for a 15" model this time around, and WOW! I used to swear by 13" MBP, but with this 15" rMBP, I can work anywhere without an external monitor! ironically that makes it more portable than a 13" model, at least FOR ME. I'm really glad I went for a 15 rMBP instead of 13". I'm sure 13 rMBP is a damn fine machine though. but like I said, for me, it was surprisingly better than what I expected in terms of usability. so I just wanted to share my impression of 15" rMBP, coming from a long time of sticking with the 13", with guys that are on the fence and not knowing which one to get.