Just got this one last night, based on reviews I've read and the fact that it's by Oshii Mamoru.
I liked this one a lot. It grabbed me from the very first scene, (a kick *** aerial dogfight). The trailer would lead you to believe that this is an action movie, but it's not. It's a very character driven drama. It gets a little slow at times, but I was never bored. The few action scenes there are, are spectacular!! Basically, it's about a world where teenagers fly planes for corporations that are at war with each other. The drama centers around kids trying to deal with the harsh realities of war. Pretty heavy stuff that is frankly hard to tackle in the confines of an animated movie, but it works pretty well.
The mix of CG and 2-D animation was very well done. PQ and especially SQ were excellent.
I highly recommend this one! Every anime or Oshii Mamoru fan should ad this one to their collection.