One of the older ships afloat right now, but was renovated about 5 years ago. They added new venues but also ripped out lounges and public spaces to add more staterooms.
You'll probably be OK in the off season, after Thanksgiving but before Christmas - that's one of the slowest travel periods of the year, generally speaking.
But you couldn't pay me to sail a Sunshine class ship during the busy season. You'll get so fed up of standing to the side to let a crowd pass, waiting in lines to do ANYTHING - wait for an elevator, wait for the bathroom, wait for a seat at Lido, 30 minute wait for a slice of nasty pizza, etc., that you'll never want to cruise again.