I have read a lot of negatives about these materials, but I can't agree with most of what has been said. (I have read the proxy component but not the IIS part.) This training kit is just that - a training kit. It is not a reference book, nor is it a "...for dummies" book either. I used the proxy server book with no practical experience at all and found that all the answers were right there between the pages, passing the exam no problem. (after many sleepless nights of hard study of course) This book will not make you a proxy expert, there are many holes and it is very dry - making reading tough at times. If all you are looking for is a book to pass the exams, this one will do it. All in all, a cheap alternative to instructor lead courses for those seeking MCSE status.