I'm very interested in GTO as a concept and how it totally changes some 'perceived wisdom' on how poker should be played.
I often find that learning material on GTO is particularly 'dry' and I zone out after a while but G.G2 presents the information in a way that keeps you engaged and also explains that whilst this is the 'correct' way, often it isn't applicable in the real environment.
This book is ideal for players who want to learn the concepts and the thinking behind it but don't want to get dragged into a book that spends 10 pages explaining why you do X in this spot when 5 sentences would cover it!