Walrus,
I spent some time with them, but I don't think I was advanced enough in theory and playing to get enough use out of them, when I first purchased them. I'm going to review them now. The issue I have with them is that the many of the chord shapes he lists, and he lists a LOT of them, were very hard for me to even get close to. I just watched some videos , just now, and saw that besides being able to fret three strings with his third finger, which I can not do, ( my fingers don't bend back like some can ) , he was also fretting two strings with is pinky finger. So, it could be that when I counted all the dots for finger positions, and came up a few fingers short, it was because of his ability to back bend his fingers and make nice partial barres with multiple fingers. But, there were still plenty of chords that I can play, and I used to look for different voicings from his diagrams.