Let me put it this way - I have the book itself. I still bought the E-book as a second copy. That's how highly I regard Jack's work and his defense. This is without a doubt one of the top 2 or 3 youth specific defenses in existence. This defense can be whatever you need it to be - bend not break, super aggressive, flexible and complex, or very simple. Whatever you need, this book, and this defense, has.