Wow. After buying and reading several chapters of this book, I must say that it is has taught me alot of really good in-depth stuff so far, and that I whole-heartedly disagree with the previous post. It is true that this book is not a software manual... but anyone who needs a software manual should read the docs that ship with maya, and save your money for god sake!
This book seems to be geared specifically toward character work, but so far has been filled with tons of production "nuggetts" that I have immediately been able to use in the real world while currently working on a character project in Maya. I particularly enjoyed the Rigging chapter (nice!), Dynamics chapter, and the Advanced Connections chapter. All in all, having done professional film and commercial work already in Maya myself, I would recommend this book to anyone that isnt looking for a software manual, but instead is looking to learn the stuff that the manuals dont teach you, and that you normally end up learning the hard way!