I've read three of her books, and am currently halfway through another. They are very insightful and informative, and I feel like I'm learning American history for the first time. I'm just amazed! It all makes so much more sense than the way I originally learned history, which admittedly is not my best or favorite subject.
I recommend her book "Treason". I don't recommend her latest book, unless you're fairly brand new to her, because it's mostly rehash of her past quotes.
Offhand, I can't think of anything I disagree with her on, though feel free to ask me specific questions. I don't believe in having "heros", in the sense that I believe in issues, not the people who articulate them. So, I will freely and readily disagree with Ann on anything I think she's wrong on. Ask away, if you want.