We did the 40 day thingy in our church and I had a small group to discuss the book. It was interesting but bore little or no fruit, so I don’t have much faith in that.
Ours was a tremendous success, so much so, we had to add on to the church and are starting a second building program in the four years since. We are using our own material in the small groups now but the model was just right for our situation. The number of RCs that have come is what amazes us. We baptized a whole family Sunday after they went through our “Basic Beliefs” class.