First off, this study guide consists of mostly questions and answers and very little actual content to help you learn the subject matter. This is not necessarily an issue but just something to be aware of.
I found the quality of the questions to be less than stellar. I came across several grammar and spelling errors, as well as missing words in the sample questions; one example: "Conduct regular heath checks" should have been "health checks". This is very disappointing and inexcusable especially when all word processing software packages catch these automatically. Seemingly minor issues such as these, and the fact that several answer keys had the incorrect letter designation (e.g. choice "b" instead of "a"), really made me lose confidence on the validity and accuracy of the material. Given that the PgMP is designed for seasoned professionals, this guide definitely did not meet the standards that I would expect in terms of overall quality.
All in all, I would rank this as a very average study guide due to quality issues that create unnecessary distractions. I definitely would not recommend this given there are other options in the market.