Have you done any iOS development in Xcode on that 13" MPB of yours? Unless you have excellent eyesight and use a screen resolution that gives you the max real estate, it's incredibly frustrating to use the code assistant editor, or to run the simulator.
I must have spent a couple thousand hours of iOS development on it. I use the default 1280x800@2x resolution with Xcode filling the screen (but not in fullscreen).
