I decided two weeks ago that I really needed a laptop and that it would be a Mac. There were only two choices: the 11" MBA, for the sheer portability, or the 13" rMBP because of the screen. I doubted and doubted, tried them both out several times in a few shops and finally ordered an 11" MBA last week.
The shop delivered an 11" MBA, but the configuration was not what I had ordered. I informed them, but still unwrapped it and played around for the better part of two days. On one battery, by the way: amazing how long that machine lasted. I loved the size, the keyboard, the trackpad and even the screen. But the way Apple renders fonts, the top of a T and many other horizontals show up blurry on all screens except on retina. Also, I felt I had to scroll all the time because the screen is 16:9. And because it's actually a pretty high resolution for such a small screen, I had to zoom in all the time. So I started to doubt again
This morning, I was back in the shop. I compared the screens, the size and the weight and walked out with a 13" rMBP. It's really not much bigger or heavier than the 11", which is a bit of a surprise. But the fonts are perfectly crisp and the 1280x800 resolution (x4) is just perfect for me. I really liked the 11" but I love the 13" rMBP.
My first TimeMachine backup is running and I'm configuring the machine as we speak.