Celebrity Summit is an older ship. Well maintained and very clean. I think every time I used a public bathroom, there was someone cleaning in there. It almost seemed like their job was to stay in there all day and clean each stall after every use.
Compared to other ships, their activity choices were less (ex. Bingo, game shows, pool party games, dance lessons, ect), but they had more areas for socializing (coffee bar, lounges, ect). I'm sure it is because they age of the guests is higher. :)
Embarkation- we had a royal suite so this was easy. We were escorted and we were onboard in 10 minutes. When you get onboard they take you to Micheals club . This is your private club only for suite guests. They serve you treats and drinks until your room is ready. The butler then meets you and escorts you to your room and provides a 10 minute speech of all your entitled to as a suite guest (I won't spoil it, but it's amazing)
Worth the money. We had a room on the left hand side, in the back. We faced NYC in NJ and the pier in Bermuda. It was quiet. Balcony is semi-private bc although there is an awning over the balcony, the verandas above can see between the pieces of awning. Dinner was only 3 floors down the closest staircase, and buffett was only 4 floors up the closest staircase. The only major thing on the other side of the boat was the theatre and gym. Other than those, everything was close to the room.