I really looked forward to this book and took it with me on my tour of mayan sites in the Yucatan. However, I found that this book offered very little more than was available on the posted signage at the sites. Also, many of the maps are inadequate. I often found myself going to my Lonely Planet guide (Belize, Guatemala & Yucatan) for more detailed maps and decriptions of archeological sites.
Although the author presents the sites in a "tour" format, in practice it is hard to follow, and since the descriptions lack photos, it's very difficult to compare what you're seeing with what's written in the book. Although there are photos of the sites, but not of the specific items that the author is describing.