Summary: There is noticeable lag when scrolling in browsers, and the general performance of the machine seems slower than my significantly less powerful Macbook Air. Any picky computer user will notice this immediately. The performance should be flawless given the hardware, but it looks like Apple's idiotic full-screen scaling solution does not work nearly as well as Windows text DPI scaling.
Pros: Screen color/brightness. Powerful hardware. Good keyboard and trackpad. Nice looking design.
Cons: One of the worst computers I have ever owned. Feels like an early Windows Vista machine. Got this from work shortly after getting a 2012 Macbook Air.
Summary: If you want a proper unrestricted OS that has lots of software available and is compible with more external devices you'll have to dual boot Windows also so there's another 100 or so dollars.
Pros: Light, portable, battery life
Cons: Slower than 1000 dollar Windows laptop. High res screen is useless because the built in card is junk for how much you are paying and can't keep up. Less upgradeable then PC laptops. Apple often solders hardware onto the motherboard. The parts that you can change like SSD will void warranty if you do so.