I also got the book yesterday. I like it a whole lot, although I probably won't use it as much as I use the BoVD. I thought most of the art kinda sucked to be honest, especially the chapter openers which were great in the BoVD, and I think the picture of the half-orc paladin and the succubi is moronic. That being said, the text around the picture is actually good, and it's made me realise that no one in the party bar the paladin is actually good, and he's far more lawful than good. The discussion of good is well considered, appropriate and generally will make my game better. And that surprised me.
The variant rules are cool too, but I preferred the ones in the BoVD. I would have liked to have seen a good version of the sacrifice rules using Knowledge religion.
PrCs are fine, tho nothing amazing, and that kinda goes for the rest of the book too. I really like some of the stuff in there - the apostle of peace, the expansion of the celestials generally, and unlike UK I liked the celestial paragons. I liked the saint rules and in particular I liked the rules for relics - something I've always wanted in my game but never sat down to try to nut out.
I like the way they're tying the other books together, but there's some problems. The appendix of celestials and the expanded summon monster lists are much appreciated, but they list cervidals twice, Ghaels not at all, mention lupinals as a creature in the BoED when it's not and a few really frustrating mistakes like that.
Over all, 4/5 but if the mistakes hadn't been there it would have been a 5/5