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.
Werfin' nebels yo!