This was good for what it is supposed to be. It is a set of questions and detailed answers explaining why that choice is correct. If you're looking for a course book with domains 1-8 detailed chapter explanation then, this is not for you. I'm grateful this was available via Kindle Unlimited so I grabbed it.
The questions are all scenario based and answers explained. I am close to taking my test and decided to go through the questions/answers to see how I fair. I feel like I did ok and some I got incorrect even though, I had narrowed it down to 2 correct choices. But, it helped me understand why those were incorrect. My recommendation, before picking up this book, is to thoroughly go through the CISSP reading materials and understand the concepts to the best of your knowledge and capability. Use this resource in the last week or so before taking the test to further get into the mindset of a CEO/Security Advisor.
Good Luck to future CISSPs!!