This is definitely a textbook, and one I would highly recommend to anyone doing any level of preaching or research on the prophetic books. It is not organized cannonically (in the order the books appear in the Bible), but rather chronologically (when it is most likely they were written). Rather than give you a straight-forward "here's how it is" factual approach Bullock outlines the various controversies and stances regarding each book.
That latter fact itself makes the book very valuable, for where commentaries or other books take one perspective and tend to present that as fact, this one presents varying perspectives. It definitely points towards one perspective in each case, supplying reasons for that support.
I'm not so sure I would recommend this for more passive Bible study, of the "I just want to learn a little more about the Bible" variety. Rather, this book is for anyone who really wants to dive in and study about the prophetic books and start to try understand them from a more academic perspective.
So, in the end, this is a solid book to supplement any Bible study being done on the prophetic books.