Mike Griffiths is a renowned project manager, trainer, consultant and writer, holding multiple project management and Agile-related certifications. But more importantly for PMI-ACP aspirants, he was a member of the PMI-ACP certification steering committee. The fact that the guide is authored by someone who was involved in creating the certification makes it the unofficial official study guide!
Mike has taken the essence of the 11 Agile reference guides and put it into a conversation-style, easy to read and to-the-point study guide for PMI-ACP. The guide clearly outlines what you need to know for the exam and what you don't. It saves a lot of preparation time that would otherwise be wasted in studying for topics not included in the exam. Mike does tend to assume some familiarity with the PMBOK Guide, but it's not really significant.
The guide provides plenty of short exercises, which are quite interesting and mighty useful in reinforcing the concepts. However, the end-of-the-chapter sample questions are somewhat easier than the questions on the real exam. So, don't get complacent even if you score 90% on those questions. Overall, the guide has about 120 sample questions, the same number as on the PMI-ACP exam.
One striking aspect of the guide is the liberal use of visuals. It's an absolute joy for the visually-oriented like me. The addition of green color in text and visuals gives it a refreshing look. The top-notch quality print, paper and binding really top it off to give it a premium feel. The price of the guide (about ~ USD 67) is definitely on the higher side, but it's really worth it in my opinion.
The only downside is the lack of an electronic version. It means that you cannot read it on your favorite iPads, Galaxy Tabs and Kindles, and must lug around a 5-pound block of weight.
Conclusion I have absolutely no hesitation in recommending this guide. It's one of the best study guides that I've ever come across. You simply cannot go wrong with it. If you are preparing for the PMI-ACP exam, then this guide is a must-have.
Disclosure: I have no affiliation with the author or the publisher of the guide.