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It's difficult to be sure exactly who this is aimed at. The book's intention is to encourage guitarists to go beyond straightforward chord-melody playing and develop a polyphonic approach. As someone who has been playing for over 20 years, and experimented with chord-melody styles for most of that time, this appealed to me because I wanted to refresh my playing and improve my abilities as a jazz guitarist.
The first half of the book (which is under 100 pages long) takes a brisk tour of the building blocks: basslines, sevenths and tenths, and the CAGED system. This is very useful, and it's always good to take stock of these things, but half is a large proportion for something I am basically familiar with. Conversely, for a guitarist who is only just starting to think about solo guitar, it is probably a bit too brisk, and there are more comprehensive guides to an area that merits a lot of work.
The second half of the book takes an original melody by Martin Taylor and shows how he would apply the concepts explored in the first half to a real example. This is much more useful and I have begun to apply these concepts to my own arrangements.
If you haven't tried solo guitar playing before, this book may be a little daunting, although if you enjoy a challenge and are willing to work at it, this book does provide a lot of areas to investigate. If you feel more secure in your abilities and are looking to improve, there are also a lot of areas to explore, but you may need to skip material you are already familiar with. The book could probably assume more knowledge as there are already plenty of resources for less experienced guitarists.
The audio examples and two video lessons which can be downloaded, are very useful although they feel like an added extra.
It's great for beginners/Intermediate. Also, if you teach jazz guitar it will be fantastic for your students. Big criticism is he doesn't use a jazz standard. Probably due to copy-write. He does use the chords for Autumn Leaves with an original melody but who is going to play that?