The author used his own weird notation (dividing the board into W1-12 and B1-12) which made it much harder to read than was strictly necessary. Plus, he has this weirdly pedantic tone that reads like a 50's sex education film strip. He was very fixated on backgammon hustlers, which I found strange (but maybe it was a problem in the 70's?).
I understand that Magriel's "Backgammon" is superior in every possible way, though I haven't read it yet. I got this book for free so there's that. The general advice is reasonable enough, and he does present some decent shorthand methods for estimating race position.