Screen real estate. I've read plenty lately about the resolution on the retina 13" is nice and clear but when running Xcode screens it's too small to look at it for very long day in day out. That's the only reason. I know you can change the resolution when you are in Xcode but switching back and forth would quickly become a pain I fear.
But I could get one heck of a 13 inch pro for the same money!

kinda like a spec ed out air, it would scream!
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