To understand where I am coming from: I am a licensed cycling coach and serious cyclist. I've been using a bicycle power meter (PowerTap) for years, and training with an indoor power-based trainer for even longer. For full disclosure, I have also met both authors in-person, and I know one of the authors quite well.
I highly recommend this book for any serious cyclist. I gobbled it down once, and I am now on my second reading. I have learned quite a bit on the subject by reading the book, despite my prior experience and training.
I enjoyed and appreciated the book because:
(1) COMPREHENSIVE!! This is perhaps the book's best feature--nothing seems to be missing. Every subject of which I am aware, as it relates to training with a power meter, is in there. Plus, I found information about which I was previously unaware. Joe Friel (renowned cycling coach and author) writes an introduction, and as he said, no other book even compares, at this time, in terms of content.
(2) AUTHORITATIVE. The authors are recognized in cycling circles as two of the most knowledgeable persons in the United States on using a power meter for cycling training. The authors' combination of an experienced cycling coach and former professional cyclist (Allen) and an exercise physiologist / scientist (Coggan) is not available in any other cycling training book, to my knowledge.
(3) EASY TO USE. The chapters are organized logically and, on my second reading, it has been easy to go back to subjects that interest me more than others.
(4) NOT TOO COMPLEX. The authors touch every subject thoroughly and comprehensively, but do so in a way that is not too difficult to understand or grasp. Admittedly, I was already very familiar with the basic terminology of training with power prior to my first reading. Even so, it seems to me that someone with very little prior exposure to training with power would grasp, and benefit from, much of the content on first reading.
Despite my five star rating (which I give without hesitation), I felt that the book had a couple of distractions:
(1) The writing style is a bit choppy and sometimes lacks flow and sophistication. Occasionally, the style is a bit colloquial or informal. Then again, cycling coaches and scientists are not usually known for English professor type of writing, so the style was almost expected and happily tolerated.
(2) The authors sometimes toot their own horns a bit too much. Besides writing this book, the authors developed one of the first (and in my view, one of the best) third-party software programs used to analyze power meter computer files. In the book, at times, the authors did not hesitate to give full accolades for their own software product, while giving not so generous treatment of other products. The bottom line, however, is that their products probably deserve such high treatment. But, it was a bit of a distraction.
Overall, I felt that this type of book should have been published years ago. Now that it is here, I expect to refer to it again and again. It's one of those books that you can read several times and learn something new each time. But, I never seemed overwhelmed by it. I highly recommend this book for any serious cyclist.