If you are already knowledgeable about infosec and already work in the fields then this might be too much book for you. It's not until chapter 4, page 150 that you actually start to look at the domains that CISSP covers. Everything is described in minute detail, and I found it incredibly dry and hard to read.
If you're after a guide that also gives you every best practice for every aspect of infosec then by all means go and get this book. If you are new to infosec and you have management or design responsibilities then order 2 copies! but if you are already in the role and you just need to pass the CISSP then I would go elsewhere. I shall be buying the CISSP 11th hour book from Syngress.