Jim (and Iain) - Have followed your Celebrity travels for years. Our first Celebrity Cruise was almost 22 years ago. May 2002 on Constellation's third voyage. We loved it. Then, away went the Michel Roux food, then the "classes" and the overall reduction of services and increased prices and ships getting bigger and bigger.
We have a total fit with Oceania. We love the Regatta Class ships. Not everyone does, but we do. Marina and Riviera are fine too and our next Oceania Cruise is on Vista. We find the experience low key but elegant, excellent food and service, TRIVIA!, just a lovely experience overall. Mostly no children. I don't drink so everything is essentially included for me. That said we are returning to Celebrity after 5 years for a TA on Silhouette in April. More about itinerary in that choice, but we will be very much be comparing to our Oceania experiences...so see if we would return again..
Joe