I'm writing this review as a parent, not a professional, for the benefit of other parents or non-behavior analysts who are interested in learning more about ABA/verbal behavior.
This book is aimed at professionals or at the very least, well read laypeople. Don't read this book until you are familiar with the basic concepts of applied behavior analysis. The book does define terms such as establishing operation, tact, and mand, but you don't want this to be your introduction to ABA. As well as other introductory texts on ABA, I would recommend reading Mary Lynch Barbera's The Verbal Behavior Approach first.
This book will not make you (the non professional) a behavior analyst or capable of implementing your child's program yourself. What it does is give you a deeper understanding of the theory and practice of verbal behavior so that you will be able to understand and assist in your child's program. Verbal behavior uses different concepts from traditional language development materials that you may encounter in speech language therapy. Instead of phonology, syntax, semantics, and pragmatics, Skinner's VB theory looks at the functions of language--requesting, labeling, echoing, etc. By understanding this classification, you can understand your child's specific strengths and weaknesses more thoroughly. (Do note that the initial assessment presented is at a 2-3 years of age level; it does not accommodate all possibilities.)
The major flaw of the book is that it was published in 1998 and I do hope that a revised edition is issued. It is lacking in a few notable respects: for example, the research on AAC is much more developed than is presented here and the study of PECS in particular has been much advanced. Sundberg and Partington are not anti-AAC, but I believe that today they would have more information to provide in implementing it and supporting its use.
The language is also an issue. This is obviously a book for professionals and not one to comfort parents, but some of the terminology is no longer used and is opposed by autism advocates, such as using "training" instead of "teaching." The term "compliance training" made me wince, even though the definition is fine (that the first focus of ABA is to get the child to trust the therapist).
However, despite the age of the book, it clearly addresses issues which are still a problem today. The authors emphasize the need to tailor the program to the child's needs, to use activities which are highly motivating, and to make strong use of the natural environment as it provides strong reinforcers and enables the child to generalize rather than only be able to use rote speech.