I'm in a quandary about how to rate this book. On one hand, it's well written and organized, and definitely follows its charter. From page ix of the Preface, the authors state:
"...we hope to convey the spirit of design used in the development of modern computing systems and what impact this has on computer science students.... Most organization and architecture textbooks present a similar subset of technical information regarding these basics. We, however, pay particular attention to the level at which the information should be covered, and to presenting that information in the context that has relevance for computer science students."
Essentially, the book covers everything a Computer Science (CS) student would need to know (at a fairly high level) about computer systems, their peripherals, and their interconnections. However (and this is the "other hand"), because of their focus on "relevance for computer science students," this book reads more like an extension to a CS "survey" book than it does to a Computer Architecture book.
Though interesting and useful, most of the material (well over 50%, and maybe up to 75%) duplicates material from other courses in a CS degree. To me, every chapter except 4, 5, and 6 resembles summaries of other courses the CS student will take later (actually, chapters 1, 2 and 3 would be from that real "survey" course). Along with the duplication of material, this means that nothing gets covered in depth. Once things get technical, the authors gloss over the details and move on.
Personally, I think that Patterson & Hennessy's Computer Organization and Design: The Hardware/Software Interface, Third Edition (The Morgan Kaufmann Series in Computer Architecture and Design) (The ... Series in Computer Architecture and Design) is a much better book for learning Computer Architecture and Organization. That book is definitely hard slogging for CS-types and has quite a few editing and organization rough spots. But, it covers the area well and without duplication. Still, because THIS book is true to its stated aims and is very well written, I have to give it a Very Good 4 stars out of 5 rating (though I'd really like to reduce that to an OK 3 stars out of 5).