I'm glad I read this because Hockney's work is more diverse than I had realized. I was struck by how conscious and intellectual his approach is, and how much he pursued a connection with many art styles which preceded him. I gather from the introduction that Hockney has a reputation as a "popular" artist rather than a serious one, and the book certainly convinces me of his seriousness and contributions to the world of art (not that I personally had doubted it).
The best aspect of the book are the color plates, which are vibrant, though there is a challenge to capture a ten-foot painting in a book which a bit under 10x8 inches. Unfortunately, there are also a large number of two-inch square black and white reproductions and these border on useless given their lack of color and small size.
The authors state in the introduction that the book is "not intended for academics." Could have fooled me! Pictures are analyzed in a structural and detailed way, and the prose is so stiff and complex that I am afraid much of it baffled me.
It's also frustrating to read this book because the text is often several pages away from the plate it is describing. I spent a lot of time flipping back and forth. But I suppose there is no way around this, especially when the color plates are full-page. Still, it would have been preferable to have them on the page following the text, rather than frequently many pages away from it.