The author, Nicholas Zakas, has always been a strong writer and I have found his other texts to be very easy to read and pickup various things that have helped me. There is no question as to the knowledge of the author or his ability to convey the information in an easy to digest manner.
I feel chapter 4, Constructors and Prototypes, and chapter 6, Object Patterns, make this book worth the money alone. The author also continues to cover Functions (and how to really leverage them), as well as the core basics that trip up many folks such as Primitives and References.
On a side note, the technical reviewer for the book was Angus Croll, and the forward was written by Cody Lindley. If you don’t know who those cats are then you should look’em up. They are what some folk might refer to as “legit” when it comes to JS.