My wife and I sailed Celebrity Summit because the dates lined up with my 50th birthday during the cruise, and I chose based on the locations I wanted to visit. I had been to the Caribbean once before to visit the Bahamas and wanted to see more of the area.
I will preface this review by saying I had never been on a cruise before. My wife had taken one cruise previously with Royal Caribbean, so our experience with cruising is limited. Her overall impression is that she preferred Royal Caribbean, mostly because of better food and better overall service from the staff. Overall I would say Celebrity is good in almost every way, but it is very hard to rate them better than good in any particular category.
I will start with the good impressions. It's great that Celebrity offers a cruise sailing from San Juan because, for me, it was the highlight of the trip. It is a beautiful city that combines the history of Old San Juan with its forts and colorful architecture with New San Juan and its fantastic beaches (all public) and friendly people. I would encourage anyone to visit.
Cabin was roomy enough for 2 of us. It was cleaned numerous times per day by our attendant Astel.
Small beach and even smaller area to walk and see what the city has to offer at port area
Good shopping, friendly people, it helps to speak a little french
Good shopping right at pier area, very scenic