It is a good book but should you buy it or not, depends highly on your level of maya knowledge. I would say that it is for someone at beginner to intermediate level. I got it solely for the bullet physics which is a new thing in maya 2013. And except for one reference to it, i didn't find anything about it. So, if you had an earlier version of this book, don't buy it. It is nice to have it in your collection.
The is the most professional industry book, and it is recommend it because there's a chapter how to model a character which I found it really interest it. However, you will have to learn the basics of Maya before reading the book because it is an intermediate and higher level, but you can still buy it and you can always look for basic Maya tutorials on youtube or websites.