We cruised on the Summit from Puerto Rico in November and had a wonderful cruise. This was just before the refit and the cabins were a little tired but nothing that you would complain about - so the refit should make it even better!
Food in the main dining room, buffet, cafe and speciality restaurant were all excellent. Lots of choice and all good. Entertainment wasnt the best and the ship went very quiet at about 10.30pm, even in the casino but this could have just been the week we were on it. Staff were very friendly and did go out of their way to help you and were very attentive. Drinks were a little pricy, but that is the same on many of the ships, we are not big drinkers so didnt affect us much.
Recommend that you go to the captains party etc as these were very good, and the sail away on the heli pad was great fun as well.
Hope you have as much fun as we did - we have booked again with Celebrity on the Eclipse