This book appealed to me for two reasons. First, Xiao-lei is a mother of two trilingual boys. Second, she is a scientist with background in linguistics and psychology which can be felt throughout the book: it is a small scale, in-depth, longitudinal study of her two son’s first decade of life.
That said, if you’re looking for a foolproof guide for raising your kids in three languages this book is NOT for you. The strict and extremely systematic approach for raising their kids multilingually won't be everyone's cup of tea. However, this book brings to the forefront many issues that you might want to consider, it offers plenty of examples and strategies.
My wife is Chinese. I'm German. And we live abroad. So our plan is to raise our kid in 3 languages, including English. This book was very insightful, gave lots of interesting examples, made me aware of situations I would have not thought about. I read another book about multilingualism, but this one was by far better. It also seems very grounded in research so it's not just a base on hunches and gut feelings. Yet, the way it's written, it's very approachable and an easy read. I can only recommend this book. I just found out that there is another book from the same author about the same language situation but for teenagers. That's definitely a book I will check out in 10 years.