I'm actually reading it right now.  It's a good read, but it has basically just reaffirmed positions I previously held.  There isn't a lot of new information here.  Hedges does do a good job, however, of putting all of the info together in a way that makes a coherent case that the Christian Right meets all the characteristics of a fascist movement.

I found Sam Harris' "The End of Faith" much more provocative because it added something new to the debate (i.e., religious moderates and liberal theists are guilty of enabling the extremists and fundamentalists).  Reading Harris' book actually shifted my positions on several issues.  For example, I had previously looked at the Palestinian resistance movement through a primarily anti-imperialist lens, viewing their religiosity as incidental and superficial.  Even though their stated goals include the imposition of Islamic holy law on all its people, I still held some naive view that they didn't really mean it, that they really shared my secular anti-imperialist aims first and foremost.  Harris enabled me to re-evaluate my assumptions and avoid the pitfalls of cultural relativism.

So in conclusion, "American Fascists" is worth the read, but only if you want to reaffirm your own worldview.  "The End of Faith", on the other hand, is excellent in that it brings a lot of new perspectives to the table (at least for me it did!).