We just started a study on this book in my neighborhood a few weeks ago. Until then, I was the only person in America who had never heard of him or his book! :-) I think it is wonderful, and was just so happy to hear how it helped the kidnap victim. Incredible.
Rick may be a 'nice' pastor but his books aren't worth writing home about unless you're writing home to say don't waste your money.
If you're studying his book you should take a look at these:
http://www.biblebb.com/files/purpose.htm