All three books in the series are excellent. They address the need for a systematic and thorough, yet informal and highly accessible, introduction to the Thai language for native speakers of English. One receives the impression that the author has taken great care to ensure her books provide the maximum possible benefit to assist students who wish to learn Thai.
The books teach both the spoken and written aspects of the language, unlike other textbooks which would leave the student effectively illiterate. Throughout the series, the author stresses the advantages of learning written Thai as opposed to relying upon a system of transliteration. In this, the second book in the series, it is finally possible to dispense with transliteration altogether and focus on Thai in Thai.
Since my wife is Thai, I had a ready source to assist me with pronunciation. Otherwise I would certainly have purchased the audio materials that correspond to the books, for it is impossible to learn Thai sounds simply by reading about their approximate descriptions from a book.