The Summit is the perfect size ship unless you need the distractions of an ice-rink, bowling alley or Central Park while at sea. It has none of those. What it does have is an adult oriented theme of eateries, lounges and night life. The food is of higher quality then even it's sister line Royal Caribbean which was pleasant surprise.
The layout of the ship is simple so after a day or two it's easy to figure out where you need to go.
The cons are that the ship does show it's age even a couple of years since it's refurbishment. I found lot's of rust everywhere I looked coming through the white painted metal. The balcony and outside furniture was painted splattered from sloppy painting. The door to the balcony was incredibly hard to move.