The books from Eyewitness Travel are always good if you want a quick overview over a new destination. If you have time for doing a deeper research I would choose other sources of information. In this case we had to do a fast planning and we found a lot of useful information in this book. If you are a returning traveler or want to go deeper into the History, Geography or other issues you will have to look in other books. This is a book with lot of pictures useful for the fast overview but of less value for the ambitious traveler.
I will definitely buy a guidebook from Eyewitness Travel again, if am going to visit a new country despites it's superficial or perhaps because of its superficial way to describe the country.