Art Book Walk-throughs & reviews was born out of the frustration of wanting to see more of what's inside of art books (more than just the few pages that sites like amazon show).
I don't know about you, but when I want to purchase an art book, I find I have a couple of ways to find out more information about it. Amazon, and actually gong into a book shop. The problem with Amazon is that you normally only get a small number of page previews, and you hope, that those page previews, represent what's in the whole book, but often I find they don't. So then I would buy the book, look through it, and decide and then return it, if it's not for me (I hate wasting time doing this), or I could actually go into a bookstore and look for the book, but these days they only seem to carry a small selection of books.
On this site you get to see an actual walk-through (& review) of the book, which (I hope) will give you a much better idea of what's actually inside.
P.S I own all of these books