I was very busy at gencon so I didn't have time to read it all, but the surface of the thing is gorgeous. I read a bit of the lore about Thassilon and a bit of the adventure itself, and these seemed good. The bestiary was very well done.
One complaint I have is that the pre-gen characters had some superscript numbers for which I could not quickly find a legend. If I hadn't already seen the feat that was referenced in the player's guide, I would have no idea what it does.
Anyway, Paizo's booth was excellent and pathfinder looks very cool.
Pathfinder's Gen Con only edition (different cover) made it into my luggage. Awesome product.
The Paizo booth and staff were great and watching the guys GM on the awsome Dwarven Forge setups was a lot of fun.
Nice job everyone!