We are 60, long time cruisers (HAL, RCCL, NCL, Viking, Uniworld), who picked Celebrity more as a matter of timing, itinerary than any great decision-making process. Bottom line - we were very happy with the result and will likely look to Celeb first for big ships going forward.
Arrived on a late flight to San Juan, so got to the ship around five. Dock is an easy cab ride - $24. Almost no one else boarding when we arrived, so very easy check in. I guess we were so late that the usual fancy greeting on the ship had ended, so were a little surprised to board and not see anyone to help with carry-on bag, guide us to the cabin. That was about the only thing Celeb missed on the voyage.
We booked Aqua Class, not really knowing much about what it was. Big difference was dining, with service in Blu, a small restaurant (90 seats) only for Aqua for lunch and dinner. We thought this was great. Menu and service were excellent -- thank you Marcel. No table far from a window, so always able to look out. No assigned seating times (dinner open 6-9:30 I believe), so we fit dinner where it fit our schedule -- sometimes we did the early show, sometimes the late one. Only one night where we arrived at a busy time and had to wait. Breakfast was more of an issue. Food was good, but dining started at 7:30, which made it difficult to get to an 8:15 shore meet for excursions. Wish they would move up the open time just a bit.
For deck 9, avoid being under the pool deck.