DH and I are in our mid-thirties, no kids. This was our second cruise which we took with ten other members of our family.
Overall, we had a fabulous time. As others have said, this ship is an engineering marvel and it is new enough that it still sparkles. It's really quite impressive when you see it the first time. Embarkation was a breeze in Ft. Lauderdale and we went from the curb to inside the boat in about a half an hr.
The passenger load really is quite international and RCL must do a great job of marketing this ship overseas. The advantage to this ship is that there really is a little something for everyone. The shows were Broadway-quality and we especially enjoyed Hairspray, Oasis of Dreams, and Come Fly with Me. We both liked Amy the cruise director and felt she did a good job. The food in the MDR was superior to that on our last Celebrity cruise. Both of our wait staff were very personable and did an excellent job with the dinner service. The roast beef sandwiches in the Park Cafe are as good as advertised and we had them almost every day while at sea. We met the Captain riding through Central Park on a bicycle one day and appreciated the gesture of accessibility.