I used to have an MBA Rev C. Now I bought a Thinkpad T420s instead of MBA. Why? Because I don't care about OS X, because it's upgradable and because it has USB 3.0 which is actually usable instead of $$$$$$ Thunderbolt. Oh, did I mention it has a docking station? The only complaint is the crappy screen that they managed to stick into a $1200 machine but since I use it as a desktop about 95% of the time it's not nearly as important.