Just started using the book with a small bible study group. Like most of Cover to Cover series it sets everything in context, has the bible readings, some background info, and Icebreaker, then a set of questions. The questions are sometimes a little simple but they are a starting point for discussion. Would recommend.
It was easy to understand and as someone who has to lead a Bible study found it very helpful to me in being able to speak to others. I would recommend it to a group or individual who was wanting to find out more about The Holy Spirit.