Came from Sony UX390/490, TZ180/TZ21, G11.
Tried using the Air as my sole ultraportable since I got it.
And now, back to a combo of the Sony UX490N and TZ32 in the main, although I'm refreshing other TZ's to same or TZ2500 spec, and have replaced my Dell M1330's with Sony SZ71's and also have an X300 (which, like the Air but to a lesser extent, I'm not 'getting' in comparison to the TZ as an all-day portable tool). All in all, the UX/TZ combo (actually, even just the TZ) is much more useful and functional than the Air.
Although I still venture out with it occasionally, I tend to use the Air now for keynotes, meetings, etc where the Air might be a better thing to have image-wise than the Sony's.