Got mine (1.6/80g HDD) a few hours ago, and liking it so far.
I read somewhere (it may have been earlier in this thread) that the Air was 'sluggish' on starting it up for the very first time. I would have to say I found this too. For a while, I was worried that I'd been sold a dud: it felt like the problem was the wireless, that the Air just wasn't playing well with the wireless network. As part of this problem, it plain refused to read the iWork disc I had sitting in my MB Pro, ready to install the apps to the new Air. It could see the disc, but kept saying that it 'couldn't find the original' or some such. One quick restart and a software update later, though, and it's working fine.
I report all this just in case someone else finds that their machine just ain't working right when they first get it home. Let it crawl through the software update, restart it, and hopefully things should be working as smoothly for you as they are now.
After this brief hiccup, the remote disc installation of iWork went fine. I didn't really even notice it going slower than you might expect. Since I imagine I'll rarely use the facility, I have absolutely no complaints: easy to set up, and quick in operation.
As to the rest of my experience with it so far:
I love the keyboard. Love it. It feels ever so slightly springier than the MacBook's - at first sight, you might think they're identical, but this has a more responsive feel, I find. (It's not yet dark enough here to test the back lighting, I'm afraid!
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The build of the Air as a whole is nice. Sleek, but not flimsy. The screen does flex a little - but compared to my 17" Pro, I'd say the flexing is not as extreme. The whole thing feels pretty sturdy - and, of course, nice and light.
The screen is bright and sharp, and the 'wake-up' time when opening it is remarkably fast. The whole unit is so light that just pulling the screen open can be enough to move the whole computer! I'd recommend trying to hold down the rest of the machine while you do so.
It runs quiet and cool, too. I can hear the occasional whir of the HD, and a very slight hum of the fans - but nowhere near as loud as either a MacBook or MB Pro.
Start up on this model is slow. We tested start up on both this and the SSD version in the store - the SSD start-up is brilliant and swift, miles ahead of this. But I'm one of those people who very rarely fully powers down their machine, so it wasn't enough of a deal breaker to make me shell out the $1000 more! (Generally, the SSD machine is swifter all round - but again, for my needs, it wasn't worth paying the much bigger price. And, for day to day purposes, the difference in speed - while definitely noticeable - wasn't earth-shattering.)
Everything else seems to run pretty well, though. It's not as fast as my Pro, but then I didn't expect it to be. But it's certainly fast enough when dealing with Safari and Pages, the two things I'll be using most on the Air. So no complaints from me.
I hope other people are enjoying their first experiences with the Air as much as I am!