So I just bought a new Air last week if the Apple website. I got the 11 inch but with 8GB of RAM. It is so fast with being all solid state drives and the new Haswell chips.
Also the Air is so light and easy to carry around and use anywhere. As I did yesterday doing work from a park and a coffee shop.
Battery life on this thing is great it lasts me 9 hours of pretty heavy workload of video watching, web browsing, emailing, and more.
The whole buying and shipping process was fast and easy. Got it in 4 days via UPS. Got the whole thing up and running with all my apps and such in an hour.
Overall I would say that this is a must buy for anyone that needs a solid fast and great battery life machine.