The lessons contain thoughtful questions. What I am missing is some deeper instruction about the Book of Matthew. Our group has only completed two chapters to date, so I may find the lessons more challenging as I go along.
I am studying Matthew right now so I can't speak about the others but I love the study. I just wish it was more down to earth than it is. I almost always have to use a dictionary to read what some things mean before I can answer. Other than that, it's wonderful and I'm learning.