I got done playing for the night. I founded my first religion and I've spawned Great Prophets out the wazoo, and completely converted another civilization to my cause. Just brushed espionage with my first spy. I'm playing with 9 other AI civs and the game takes much less time with each turn amazingly. In vanilla, it took a while for games with more than 6 AI per turn (I own a Core i7-930 first gen, for reference).
All in all, I'm pleased with the expansion so far. The game throws a LOT of new stuff at you and you almost panic over if you may do something wrong but you carefully manage.