If you get a NS, I strongly suggest getting their bunk ladder (it's 90 bucks and in stock at the factory), especially if you are an old fart like my wife and I are. Getting into and out if the cabin over bunk can be a chore, especially at 3 am when you have to go potty and it's pith black outside and you don't want to disturb your sleeping partner (in my case a possibly crabby wife)...lol.
The ladder makes it infinitely easier to get from point A (bed) to point B (floor) without making a fool of yourself and in my case waking up Ms. Crabcakes.