This book's intended market is lay Christian readers with an interest in learning what scholars think the proposed ancient "Q" text contained. (I'll avoid going into all the details of how scholars determined that "Q" existed and what it contained, as many of my fellow Amazon reviewers have already done so.)
From that point of view, this is an interesting book. Each of the "Q" sayings of Jesus are presented alone on a page, with an occasional footnote providing some explanations or interesting background information relating to the saying. A cross reference is also provided at the back of the book, making it easy to cross reference "Q" with the parallel scriptures in the Gospels of Luke and Matthew.
However, this is not a scholarly work. The introduction, in particular, seems a bit sensationalist, and the footnoting is very sparse, at best. I also noticed that the cross reference table in the back of the book seems to indicate that some of Jesus' sayings in Luke or Matthew that are identified as being part of "Q" do not, in fact, exist in both Gospels, which the authors claim is a foundational requirement. No explanation is provided as to why this is so.
I'd recommend this book as a good resource for allowing you to meditate-on and appreciate Jesus sayings without the "distractions" introduced by the writers of those two gospels (in terms of the juxtaposition of these sayings with material from other sources). Doing so is something I found to be very satisfying and enlightening. Yet, the biblical scholar in me cringes a bit at how the material is presented, and the lack of supporting and explanatory material.
As a book meant for lay readers, this work hits its target. The major negative from that point of view is the bit of sensationalism mentioned above. I also think that more footnoting or other explanatory material would have been appreciated by all readers. Therefore, I'll rate this book as three stars: worth getting, but not as satisfying as I'd hoped it would be.