I bought Airs for my wife and daughter. I would help them with something, then return to my machine, and feel a little more frustrated each time.
Airs have better hardware, better software, a better user experience, and are rock solid (if you don't hit them too hard). They don't get in your way, they just do their thing.
Macs are no-fuss machines that allow you to do your work without requiring you to babysit the machine. I'm no fanboi, I just recognize quality when I use it.