Overall, this is a helpful book for learning about common techniques for dealing with young toddlers. There isn't anything truly new or innovative, but it does make a couple of points that differ from other child rearing books.
I took this book at face value and assumed that it covered all of toddlerhood. Unfortunately it really only applies until around 2 years of age. Yes, the potty training stuff may take longer, but overall it is for the new toddler and not the older one.
If you are looking for a secret plan to make your toddler magically behave or learn something without effort, you will be disappointed. If you want to learn the reasoning behind some behaviors, this is a good read.