I bought the Course book solely to support the great work Justin does and it is well worth it for those that can afford it. [About one hors worth of guitar lessons in Australia would cost more that it did for me to purchase the book and have it delivered registered to Australia.
Content wise it has all nine Stages plus a bonus stage which includes: Chord library, How to change strings, getting s good sound from your amp, A Full Neck diagram with all the notes, a Capo chart, Justin training exercises, A blues lead to learn, Simple Finger picking "Silent Night", and solo blues.
The CD's supplement the nine stages as well as the bonus stage material.
Overall, its a quality book that's made to last and serve as a reference for anyone interested in learning guitar.
I still refer to the videos online for the initial lesson at each stage, but I use the book from then on and the CD's until I feel confident enough to move on.
Anyway, if you use the site and can afford it you will be very pleased with the book.