Very knowledgeable guide who was easy to understand, entertaining and gave interesting detail about the various areas. The guide was top notch, and as a trained archeologist pointed out interesting details about items in each room. Our tour was delayed by an hour due to a guide change, but we were notified well in advance to adjust our schedule (the night before). Not sure if the cost was different, but we paid for the early morning tour (pre-public opening). The only thing I would say is that we would have liked more time in the Vatican galleries and maybe more discussion about St. Peters. Which is a spectacular building. Prepared to be overwhelmed.