This was our third trip to Tivoli, so we did not expect much of anything new. However, our guide, Priscilla, was very well informed and had much information to relate on both Villa Adriana and Villa D'Este that we were not previously aware of. The tour was very well organized at both sites, and used the time allotted our best advantage, showing us the highlights of both sites without us ever feeling that we were being rushed through.. The group size was very manageable (14), and the bus was very modern and comfortable. Given all of the factors, including price (relative to a private tour), quality of transportation, organization and quality of the guide, I would say that this tour is a must do if you have an extra day in Rome.