This book is exactly what CISSP candidates need to prepare for the exam. The authors make sure to cover the CISSP Common Body of Knowledge in enough detail, give pointers along the way, and include sample questions to practice for the exam.
Since this is a study guide, the emphasis is on breadth, not depth of coverage, and that's the way it should be.
Several inaccuracies and typos should be corrected in the second edition (e.g. the description of lattice-based control on p. 34, or sample question 9 in Chapter 10 and its answer).
So is this now my favorite survey of computer and information security? Not quite. I still prefer "Secure Computing" by Rita C. Summers, even though it is already 4 years old. Unfortunately it is out of print, and it is a mystery why McGraw Hill wouldn't print a few thousand copies to satisfy the demand.
Another CISSP prep book is coming soon (Mandy Andress, "CISSP Exam Cram"). Let's hope it will be as good as the Prep Guide.