This is an inspiring book. Jon Damian was one of Bill Frisell's teachers at Berklee and his elegant but fun principles and techniques of composition, improvisation and "comprovisation" are must-reads for intermediate and advanced guitarists. The examples are mainly on the jazz side of the fence, but the principles apply equally well to other genres as well.
The section on 3-note structures alone is well worth the price of the book. If you've ever wondered about Bill Frisell's chord voicings here is the place to look.
I'm a gigging guitarist and this is the book on my stand in my rehearsal studio. Buy it!
Kevin - (USA)