The Sky Crawlers is a superb effort by Oshii, and after the convoluted (but pretty) mess that was Innocence, I'm glad he chose a more straightforward way to direct this allegorical tale.
I've just finished watching it, and I was avoiding any threads linked to it like the plague (sorry Camus pun). It is an amazing film, I haven't been moved like that in a long, long time. I really wish I had more to say, at this point, but I'm still feeling a bit dazed from the strength of this movie. I'd say it's the best film of any kind released in quite a while.