Whether you're doing the study for personal reasons, or leading a group study, this is worth having for your journey. Yes, there are questions that, at time, don't always make complete sense, and there are some questions that seem like they are too easy, but when you're done with each session (after reading the book, watching the DVD session that complements the workbook, and answering all the questions) you walk away speechless and amazed by what God is revealing.
Our group, when done with each session, wishes there was more to discuss. That alone should tell you that this is a worthy resource to have.
We ordered both the ebook Forgotten God and this study guide as it was what the leader of a Bible Study at our church had selected. The entire group found the material confusing and hard to understand what the author was trying to say about the Holy Spirit. We have labored through the study. The best thing was that the lack in the materials forced each of us to go to other resources to learn and clarify the Biblical Statements and functions of the Holy Spirit as part of the Trinity and His work in our life.
I have a Bible study in my home every week. We are currently on chapter 3 in this book and it's been great. Chan does a great job using his questions to get conversation started. It is definitely a Spirit-led book!