I am currently studying this text in an introductory class. It seems to be a source of frustration to most of the course's students.
The text's overall organization is to compare studies of animals and humans, discuss how they differ from or support one another, and show how they may reveal underlying mechanisms for behavior. However, this structure is never made clear. To the beginning psych student, the text comes across as a jumbled mess of conflicting data and jargon. There is no glossary supplied, and as if that weren't enough, the index is not thorough.
Most of the faults with this book arise from poor editing rather than writing. It's clear that the authors are experts in their field; however, as experts, their writing is at too high of a level for the beginning student. If this book is intended for an introductory class, the editors should be more careful about clearly defining difficult terms and removing as much cognitive neuroscience lingo as possible. Further, although the graphics are nice to look at, many of their captions introduce new concepts not discussed in the text or fail to clarify what is depicted. As a side note, the editors should also look closely at the headings and subheadings: many are placed incorrectly and add little or no value to reading comprehension.
In short, this is a good text for someone who wants a broad review of a field they are already familiar with. It will need a second or third edition if it is to be appropriate for an introductory class.