We had a knowledgeable guide who gave us significant perspective on the Duomo. If that’s a major interest, you’ll find this tour to be worthwhile. But the rooftop aspect of the tour is comprised of climbing up and down old stairs and looking out across old buildings. I’ve gone on lots of guided tours in other cities that worked out so well and I rated them four and five stars. In comparison, this is a three star tour that a few of my group ended early. Probably better to spend your time on a tour that just focused on the Duomo.