We were on this cruise as well. We had a wonderful cruise. Except for one undercooked steak in Prime 7 (which was immediately rectified), we thought was the food was consistently outstanding in all dining venues. Except for some spotty service at the pool deck, service was terrific across the board. Culinary Arts Kitchen was wonderful. Excursions were generally excellent, including the free ones. The only real negative was the spa - our massages were very good, but they are very salesy/upselling, which is a little off-putting. But we had a great trip and would not hesitate to book again (this was our second Regent Cruise)
Disembarkation in Civitavecchia was super easy. We did not go through customs or passport control (I asked Reception about this beforehand for planning, and they acted like they had no idea), so we just got off the ship, picked up our luggage in a tent right outside the ship on the pier and went to meet our car service. I think we walked off the ship at 8:45am and were in our car by 9:15 (only because that was when I arranged for the car - we could have been in the car by 9 had I known how easy it would be).