Oh I dunno.
My 1.33Ghz X300 and TZ's launches some equivalent programs faster than the Air. Heck, even the UX launches some programs faster than the Air. I'm productive be it with OS X or Vista - and in some ways (like remote access solutions) I'm more productive with Vista. I can choose between sleep or hibernation for additional power ekeing. The wireless actually works. They stay more constant with the fan / temp, don't turn into furnaces at the drop of even a slightly hogging program. They don't bend. I could go on.
The Air is a compromise of everything an ultraportable should be for image. That said, the X300 isn't for me and I'm going back to the TZ.
Oh well, off to book my Air in for an issue. That makes it 100% for the number of Intel Macbooks I've had that has needed some sort of attention. As opposed to zero incidents for Lenovo and Sony in the same period - and we aren't talking just 2 or 3 machines. It's not just the functionality, quality is a compromise too.