This book is amazing, it answered a lot of questions I had. I'm actually reading it again for the second time, and learning even more than the first time I read it, and that was only a few weeks ago! Highly recommend it.
I didn't learn a lot of new material, but this book helped me to organize my beliefs about fasting. It encouraged me and challenged me to live more biblically. This is a biblically solid book and I recommend it for all who want to go deeper with God.