In 2009 we did sail on the Summit a B2B and we were not impress.
This year we choose to try it again mainly because it was leaving from San Juan and the itinary.
The ship looks nicer than 5 years ago, we even took the same cabin (8066) concierge class (C2 this year it was a C3 in 2009) , we like it very much.
Nice cabin we were happy of it, but carefull there is a service door in front and the door was banging constently during the day