We just returned from the January 19th 7-day Southern Caribbean sailing of the Celebrity Summit. It was an excellent cruise. That said, I think the "Solsticizing" of the ship is, on the whole, a negative. More details later.
Background: This was our sixth Celebrity cruise, our third aboard the Summit, and our seventh overall (one cruise on Princess). Our first cruise was in 2007, and all of our cruises have reviews on Cruise Critic. My wife (31) and I (37) are professionals living just outside Washington D.C. We have no children.
We have cruised on spring break before, as my wife is a teacher, but this time we were able to do so in January, which we prefer. There were very few children on this cruise (never heard an exact figure, but I'm pretty certain it was fewer than 50, and most of those were less than six years old), which we both appreciated.