This is the kind of book that I really have wanted for a while. I have been playing guitar for thirteen years, have taken college jazz guitar courses, have played fingerstyle guitar for at least six years, and get really impatient with instructional material. Usually I will disagree with what the material is saying and then cite many other sources from my past experiences as a historian would in an essay.
As I said in my review of my review of the Lonnie Johnson book, there is no instruction in the formal sense. It would be a lie to say that the book does teach anything, but the instruction is natural and authentic. Imagine you just bought a Rev. Gary Davis CD without having heard it and that you are trusting that Stefan Grossman has compiled a strong selection of songs (a good move, as he knows what he is doing). Now imagine that you opened up the linear notes book and VOILA, there are the tabs and transcriptions for every song on the disc. It is absolutely perfect for what it is.
For those people who really want the formal instruction and advise on the how to play, pick up some of Stefan Grossman's other guitar books, such as the Complete Fingerstyle Guitar or Complete Country Blues Guitar. Those will actually teach you in the formal sense. This is laid out for something who has read through those materials or can't be bothered and just wants to play like they played in the long and distant past.
Play on, my friends. Play on.