I bought this book to help me learn the MODx system, which is an excellent CMS product. I had already started learning by playing around with it, and by searching the web for sites that talk about it (there are many). Once I received the book I dug right in and although I am thrilled that there is a book on this subject, however, the content was just not very helpful to me. I think the quality of the writing is good, but not the best I've read and some parts are a bit awkwardly worded. Still it is not the worst written either.
My biggest issue is that there are features/functions that are not covered in the book. Perhaps it is because of the modular nature of MODx, but when I would turn to the book to look for answers, they were not there. Perhaps if I were a more advanced user it would be better for me as there appears to be some great chapters on advanced programming with MODx, but I did not get there.