Damn good books. Both of them. Just remember that they're fiction and you'll be ok.
The one thing I don't like about the books is their effect on the weak minded. I had a guy come in to Murrays that talked to me for half an hour about how the Masons and the Illuminati run the world, etc. It was kind of scary... he believed everything he read and has borderline psychotic paranoia.
"And I heard a voice in the midst of the four beasts and I looked and behold a pale horse, and his name that said on him was Death... and hell followed with him."