The book itself is decent. It includes some good examples on using DevExpress ASP.NET controls. However, only a portion of the book is useful unless you purchase the full control suite. For example there are chapters devoted to the ASPxDataGrid and the ASPxHTMLEditor. The CD only includes a trial of these controls. The controls that are included are freely available on the DevExpress site, so you really aren't getting "over $249 of controls". The amazon description also mentions the Silverlight Menu and Grid controls. This book does not even mention these controls anywhere that I could see.
Don't get me wrong, I really do think DevExpress has some GREAT software products and I have used several of them over the past few years. However the book and included CD are very misleading.