i have an earlier 11-inch MBA, and I couldn't be more pleased.
Most of my computing is done with desktops -- I have three workstations, each of them sharing a keyboard, mouse and three monitors with 3 to 4 computers (running OS X, Linux, and Windows) via a combination of hardware and software KM switches.
i bought my laptop with portability in mind rather than attempting to go for a desktop replacement.
Previously, I had a 13-inch Macbook, and I found that it wasn't quite as portable as I would have liked.
I tried an iPad, but i found it too difficult to type on it, and I wanted a real computer so that I could access the file system and easily share files with my other computers.
The 11-inch form factor of the MBA is perfect for my needs. It is a real computer with a full-size keyboard, but it is small enough to be easy to pack and carry.
If I needed a new laptop, I would definitely purchase another 11-inch MBA.