THe macbook air is a very user specific PC, by that i mean its targeted at a small group of users that will make the best of it. The whole thing is built around the idea of mobility. Really light, and for fucks sake its so skinny they barely fit the usb port in the side of it. This is one thing mac is good at doing, making shit really small.
You do have alot of downsides tho. No cd drive. You want to watch a movie on a cd? not happening. Wanna burn a disk for a friend? (i know this is something that was a regular occurrence in the early 2000's, but literally am burning a cd for a friend today lol) can do it.
Your standard processor is very small, a 1.4ghz duo. I have an old computer from like 1998 that had the same processor speed hahahaha. All in all, you are sacrificing alot for the mobility aspect, but when im boarding a plane and see how skinny and light that thing is, im not gonna lie, i wish my laptop was that small.
Id definitely recommend to look at vaio's line, dell's xps 15z has a really good setup for the same price, with a disk drive, and delivers better specs. same price, and HP has a good mobility line. Remember, it will look and feel like a mac, all you need to do is drop 30 bucks to buy the operating system. Thre rest is just hardware.
^the dell i was talking about. Looks petty similar to a mac too hahaha, have yet to use one tho, looks good.