A few of the wait staff on Oceania and even kitchen have come from RSSC. Service was impeccable this week on Regatta. Food was excellent and quite similar to Regent.
The only downside of the cruise was the entertainment was more minimal - no production shows, only entertainers were a comedian, a magician and a violinist, their lounge pianist and a string quartet and the entertainment staff who sang with the on board orchestra (all excellent singers)
