There are already a lot of great reviews on Amazon, so I'll just add this one tidbit.
This book is a breakthrough for the smaller fighter. I won't go into all of the details, but I'll just say that if you are a smaller fighter, and you find yourself losing control when using wrist/ankle control, various sweeps from the guard, or arm and neck attacks; then this book is for you.
The no-gi game is much better suited for a smaller fighter who has to rely on using deep hooks and setups. This book has totally changed the way I fight on the ground.