Burt Ligon has truely written a very useful and insightful work. He helps aspiring and established jazz players to understand why jazz lines (melodies) work. He gives us a window into a complex art form and helps us get a real handle on jazz's conventional wisdom that might have gone undedected. The book is well researched and the examples and exercises are quickly applicable. You can learn more in the first 10 pages of this book then in all the "jazz licks" books. Reading music is necessary.
This book is recommended by many as a classic learning tool for Jazz improvisation. The Author analysed a multitude of great solos and boiled them down to a few essential patterns that integrate really well with the IIm-V7 chord cadences found ubiquitously in Jazz. He then illustrates how different Jazz Greats used these few patterns with many creative variations in so many great tunes.
For a jazz guitarist with limited music reading skills and speed, I found this to be a rather "dry" book and approach. Lots of insights but I found it to be a real drag to follow through... Insight - Yes ...but Excite...- No.
Perhaps I lost interest too early on. There might be great improvisation skills by the end of this rainbow but too many rainstorms!