Loved it!
The batgrowl was a bit much towards the end. Didn't bother me until then.
I don't follow the comic book at all, so I have no idea how close it is to it. It was a beautiful movie as well. Our IMAX screen wasn't "typical" but man it was gorgeous to watch.
Had a hard time sleeping last night too.
I think I was also tensed up during most of the movie, which made it hard to relax.