Just purchased this and waiting for arrival. Looks like a very solid piece of educational instruction. I bought it based on some YouTube vids I saw. I am not that familiar with Damian or his playing but he certainly is a solid educator. I just got into three finger grooves with thumb based on some stuff I heard Janek Gwizdala do and this book would probably have saved me a bunch of time. Thought I would share. Here is a good representation of books contents. http://m.youtube.com/watch?v=6ZJvJvID9YM&desktop_uri=%2Fwatch%3Fv%3D6ZJvJvID9YM A groove from the book http://m.youtube.com/watch?v=5cCeMTvQiCs Looks like it is well thought out and presented. Good work should be rewarded and supported.... So I bought it. Will give a review once I get it.