Regarding the exam, it is experience based (I can confirm). With the right experience you can take the exam without any big issue. The book is a good reference, but remember that the exam is experience-based. I took the old exam (before 14th of October). I am not sure about the new version but I guess it is still experience-based. Hope my point of view helps to others taking under consideration the exam.
The problem with "experience-based" is that it requires you to have experience (or at lest some decent exposure) in every aspect of every domain. Furthermore, there are wildly different approaches to security architecture between organisations, and my experience won't necessarily be the correct answer. CISSP instructors often caution candidates that the question is asking for the CISSP view of things, not the way your company does it.
The results of the exam were even more perplexing, the lowest scoring domains are the ones that I have had the most experience in (10+ years) IAM, security architecture. My highest ones were the ones I have relatively little experience (legal/compliance), DR (we have departments that handle a good portion of this).