This book greatly complements "The Techniques of Brazilian Jiu Jitsu", Montanha's encylcopedia of jiu jitsu techniques released in 2003.
Where Montanha's first book focuses predominately on capturing a large amount of techniques, this book contains more insight into the state of mind in practicing and competing in jiu jitsu. It's one part Zen, one part Strategy, one part Tactics and one part Lore.
If you've bought the first book, consider this an inexpensive "Behind the scenes" tour that will add to your appreciation of the raw techniques. If you haven't purchased the first book yet, consider this an introduction to the techniques, culture and mindset of the academy that has produced such notable martial artists as Nick Diaz, David Terrell, Steve Heath and Gil Castillo. The price is good enough - give it a try!