This book is quite sufficient in preparing its readers for the associated exam. The materials covered in the first half of the book provide the basics for most WCF interactions and applications. The last half delves into security, transactions, and instancing, amongst other details.
The material itself is well-presented, though some of the forward references make it hard to tie certain aspects together (e.g. message header security with attributes). However, 2 passes through the book should be sufficient to prepare any reader for the test. This was the only study material used (in conjunction with the provided test exams) and I passed the test the first time though.
The test exams are worth a bit of note, as they are not terribly connected to the book material. More than a few of the questions will touch on topics that are not in the book. Moreover, the exam answers will reference chapters in the book that are either different or do not exist. There seems to be a good bit of disconnect between the exam manufacturer and the authors. However, the book itself contains relatively few errors that will cause any problems.
The reason these errors do not affect my rating of the book is that in researching and learning about these other topics, I feel I got a more well-rounded WCF education and that it better-prepared me for the test. Some of these tangents, like the WebServiceHost, COM+, and some other attributes, proved very useful. The additional information made clearer the links between WCF and various other technologies.
Overall, I highly recommend this book. This should be the only resource needed to pass the exam, and it is quite well-written.
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