This book is written in an entertaining and engaging way, as promised in the summary here on Goodreads, but it was assigned as course literature for a university-level course in English to me, which I do not think it was able to live up to. I do not know for whom this book was intended, but if it is university students then it is disappointingly unscientific, with too many anecdotes that would lead me to classify this book as a "popular science" book rather than a book for university students.
In my opinion this book is a good read for people hoping to just get a rough introduction to linguistics and its different branches, and in that case the rather non-scientific examples and way of writing will aid in keeping the reader engaged. It is not a bad book, and the further reading sections seem, as far as I could tell, adequate even for university level studies. I personally find it a little unfitting for a linguistics course on university level, but a general reader without background in linguistics will most likely enjoy this book and find it more than enough for what they need, especially since the further reading directs towards other sources.