We just spent a week on the Summit (Jan 11-18) and thoroughly enjoyed our stay.
Highlights -
Loved the suite and now am spoiled - how hard it will be to go back to a balcony. Suite 6132 was very nice with bed facing the sliding glass door, full bath with tub (more on the tub later), huge balcony with two chairs, two loungers and a table, super staff (kudos to our butler Peter and room attendant Bernard), and overall ambience of the ship.