I purchased the book for it's attempt to describe the features of the products and how they are designed to work together, from the Crystal Enterprise components to Crystal Analysis Pro. Probably a full 25% of the book is spent on customizing Crystal Enterprise for a web site or web application. The explanations are easy to understand and cover the major points necessary to make the product work.
I am not a big fan of the "Special Edition" book series because I find them to be too general. This one fits the content style of the series to a 'T'. If you need a general reference on the Crystal Enerprise/Crystal Analysis Pro products, by all means, by this book. If you have been "knee-deep" in the product since it's release, you will probably not find any grand revelations here. It succeeds at trying to be what it is: a solid, general product reference.
Also, it is written by Crystal Decisions employees and certified trainers/consultants so you will not be told about any bugs or shortcomings in the product.
I gave it four stars just for the breadth of content and since it is the only reference for Crystal Enterprise, you can honestly say it is the best. To me, it is worth the money spent.