Acrobat 5 is a great product, but Adobe has done a lousy job of communicating its many valuable features and how to use it. Totally unstructured and unintelligible, this book is an example of what happens when computer programmers attempt to communicate in English.
I recently participated in an Acrobat focus group made up of people who use the product in their daily work. Everyone agreed that it's very useful in a wide range of applications, but they all had real difficulties learning how to use it. This book only adds to the problem.