This book allowed me to pass the 70-028 exam successfuly. The combination of questions and cases presented in this book are very accurate to the exam. During the exam, just reading the question and identifying the pattern with a question on the book was very often, that allowed me to save significant amount of time. In particular I believe that the Troubleshooting area is where this books really shines. I only whish the book had even more cases. I certainly recommend this book as a valid way to check your readiness before you take the exam.