Clearly, this is the "go to" book for instructors of project management courses everywhere -- it has an instructor's guide with an answer key, and there are even project management "logic problem" versions of this book out there. It makes it dead easy for instructors to teach by the book.
The book is expensive and it is very long. Some of the content is a bit heavy and dense. The history of project management is interesting but it's the same history you can find in just about any other project management book. The first couple of chapters are highly biased and opinionated -- and in many other areas, the style of writing is difficult to get through (I blame my inferior intellect).
Most of my execution/control project management class focused on Chapter 15 - earned value management. Lots of juicy (read "confusing") problems to work on there.
Throughout the book there are case studies -- interesting on the surface but I suspect their true value lies in their use in classroom discussions. In online courses - it's difficult to get people to actually have such discussions, so the value for some of these is not fully realized as a reader or participant.
Nonetheless - it is a book that covers a lot of territory and is widely used as a reference. I would not have bought it if it was not required for my courses, but now that I have it, will use it as a reference and for studying for the PMP.