The Good: I used this book as THE only major study source to pass the ITIL Foundations and indeed, it has the essentials to pass the exam -I passed with room to spare using only this *plus* a Transcender Practice exam (Oh yeah, and the ITIL chart that sells here for $11.) So, in one way of looking at it, there is a lot of helpful info here and it does the job to pass the exam. Also, it is the most affordable reference I could find.
The Not So Good: EXTREMELY boring! (another comment below has more detail about this) It written to be only a catalogue of Service Management elements and how they relate. A few illustrations were begun in the first chapter, but were discontinued by Chapter 2 making this very painful read. It is written in a way that the necessary info and the relationships of the processes are elaborated on enough to pass the exam, but again, so boring. It was also too repeatitive.
I hold several certifications and am the type of person who keeps all their books, however, I gave this one away the same day I passed the test. Several reasons: one, there is no index whatsoever for future reference -that would have been both easy for the publisher and extremely helpful for future needs; also, it is just so boring, nothing I want to see again. The numbering sequence when I first bought it I thought followed the Service Management Publications numbering, but not so, so there is no correaltions to that 'Bible' of ITIL. Seems to me that would have also been helpful and easy to do.
I do recommend this IF you can endure the pain and if you obtain something else to suplement. My choices of Transcender ITIL practice exam and the chart worked for me. I definitely am keeping the chart for future reference.