They are very, very tempting, but since I am looking at the S2, I decided to just get an SSD for my older Macbook pro. Hopefully that will give it another year or two. I also love the size and portability of the Macbook Air, but I would really miss the things you lose in going with that form factor (or what you seem to lose each time the MBP is upgraded!), for example, the optical digital output in the headphone jack (great for hooking up to a DAC for good audio or for playing movies from the computer), Firewire 800 (I guess you can eventually get an adapter for the thunderbolt port), and a simple ethernet connector. Those are all things I have used in the last week (except for ethernet cable, which I used a few weeks ago), so I know that adjusting to the fewer ports would be a bit annoying. Also, one USB is not that generous…if you are using a USB 3g device, for example, you can’t plug anything else in…
I am sure there are work-arounds for most all of these, and I keep wanting a smaller computer for my general use, but then when the reality of the downsizing hits, I realize I am probably better off sticking with the 15″ MBP.
