I purchased this book in the hope that it would be a good reference for a 3D engine I was building that has a requirement to load 3DStudio and Lightwave format files. On the surface, the information is clearly presented and well structured. However, code is presented as examples but is taken from the authors own library, Crossroads. This has the down side that it has a very strict copyright which practically forbids you from using it. So, no use of the code was possible - not good, particularly when you are developing an open source project!
As it turns out, the code I've generated is very similar to the authors and I start to wonder if copyright problems will arise - I guess only time will tell.
If you want to learn how a format is built up and wish to play around with the authors copyrighted files then great.
If, however, you wish to develop your own program that reads one or more of the formats outlined in this book, then look elsewhere first. There is a wealth of information on the internet that is completely free.
Not a worthy purchase.