It's actually quite good. The first few chapters are/were hard to get through because they were just about how evangelical he was and it bored me but then his change and how he started turning to reason is interesting. If you haven't read it, you should. But i'm only on chapter three, but i think its great so far.
And the headline on the front gets you too: How an Evangelical Preacher Became One of America's Leading Atheists