An amazing insight into the WordPress CMS for beginners and intermediate WordPress users alike. As an experienced developer with WordPress I found this book a good refresher, a source of some new php functions specific to WordPress I wasn't familiar with, and as a valuable insight into what my clients are reading.
The WordPress version used in this book is a few versions behind because it was published in 2011, but much of the information has the same basic principals and locations on the WordPress dashboard.
All in all, I would recommend this to anyone who wanted to know what WordPress is and what it can do for the average website. This isn't necessarly a reference manual, but highly informative non-the-less. I believe that the "PHP and MySQL for Dummies" is a good next book to progress to for anyone wanting to learn more about and dive deeper into web programming.