I seriously WANTED to give this high marks, but to be frank, it's filled with errors and gaps. There are typos, mislabeled diagrams, and while I would be willing to overlook that, believe it or not, what I am entirely unable to overlook is the giant gaping holes in the theory, where entire possible (and frankly common) lines are not considered, and other alternate lines trail off, suggesting the answer to anything down that rabbit hole is obvious. I'd be willing to think myself simply daft at that, except that computers AND better players than I agree. And please note, we're not talking about 20 moves in, we're more around...four, in places.
The intention is to create a stable and "hole-less" system for a player. The constant omissions make this someplace between bad work to a cruel joke for a weaker player.