Rita's book had come highly recommended by a number of PM/PMP peers (and almost every other review I had seen). I had no hesitation ordering this book once I was approved to write the exam. Having successfully completed the exam around 7 hours ago :), I can honestly credit the material in this book for being the reason I passed. Of course, you need the PMBoK as your basis for learning PMI's best practices, but Rita's book is your basis for understanding PMI's best practices. The PMP Exam Prep book is aligned to PMI's material, and takes it another step further by helping you to understand how to approach the exam, what assumptions to make for the exam, exercises, practice questions and numerous tips and tricks along the way. I trust that a new edition will be released to match PMI's 5th Edition release of the PMBoK, so make sure you have the corresponding edition for the exam version you are writing to. I spent four months with this book and the PMBoK together. I have zero regrets about this purchase - money and time well spent!