Here is from a fellow travel agent. This was a Rome itinerary. I searched a few groups and didn't find many agents who have sailed with them.
Well, I've been on Atlas, but not Oceania or RSSC to make a proper comparison. There is a themed dinner each night. There is also a restaurant on the pool deck as well. Entertainment … well, you're basically cheering on your new friends from the staff. BTW, you are called by name from staff the moment you board - they must study passport photos or something.
The demographic is mixed with ages (one child of 16 on the voyage I was on), and all pax were well travelled, friendly, not pretentious at all. Bobby and I would go to the bar or lounge for a pre dinner drink and all but one night, we joined tables with others we had met. We had a great time