First, let me say that I like this book a lot. It provides very good coverage of the exam objectives, and as of now it is the only book of its kind on the market. However, the chapter exams on the CD are peppered with wrong answers. Not answers I disagree with, but wrong answers. I pick (A), the exam says the answer is (C), but the answer description references answer (A). I've found a dozen or so of these, and got frustrated enough to write this review. It's not like this book was rushed to market. SharePoint 2010 comes out at the conference next week, and SharePoint 2007 has been out for years. This book came out so late in the cycle, I would think it could have been checked again and again.
Ok, enough ranting. The book is good, it is the only one of it's kind, and I recommend it. I also recommend pairing it with the MeasureUp practice exam.
UPDATED: I passed the exam with this book. Many of the hundreds of exam questions on the CD are also on the test. This book is excellent for exam prep. The CD has errors, but it also has a LOT of questions and WILL prepare you for the exam if you practice.