Well, my hubby is a tech guy who does programming and such, so of course he's all about the computing power and sturdiness. He currently has a 2008 MacBook Pro, I think. He really needs a new one, but we're saving up. I think he said we'll both be getting MacBook Airs ASAP, once the money is saved.
His main concern with the Air is that you can't increase the RAM or change the hard-drive out (both of which I believe he's done to his current model) to keep it up-to-date for speed, reliability, and processing power. However, with the advent of the new Pros, they have gotten rid of that capability, so really the only thing different is no CD/DVD drive and a lot less weight with the Air. With an external CD/DVD drive you could certainly get around that.
That being said, I think the new Pro Retinas are also without a CD/DVD drive. So, I'd vote for an Air. It's a bit cheaper. If you're not doing heavy-hitting graphics or programming on your laptop, you probably won't even notice the difference.