I like the fact that the 40 minute studies are self contained and compact. All you need is a pen. It is also good practice as I am learning to mark the text in the inductive study method. This is especially nice for anyone hesitant to mark up their own Bible.
My husband and I purchased this book to use with our Singles small group. We like it a lot. The participants like it because many of them are involved in other Bible Studies right now, and this study requires NO HOMEWORK! It is also short enough (40 minutes) to use with a group for a lunch hour study at work.