I learned a lot about parkour and also Islam from this book. I appreciate a book that focuses around a specific religion and doesn't try to convert me to said religion. It's a rarity to say the least.
I thoroughly enjoyed the book. If I had any complaints, it's that it takes a little longer to suck you in than I'd like, but when it does, it's hard to put down... Maybe it's even impossible... I don't know because I read the whole thing in one sitting.