They are comfortable for about four people. If you get the room farthest aft, the decks are about 40% larger because the deck curls around the outside of the support system for the disco. We had D-732 and there were two lounges, four chairs and a table. The deck was huge. It is a wheelchair room but they assigned it to us on a guarantee reservation. The room was quite nice made into a double bed. It was a little wierd made up as twins, however.
I read somewhere that balcony can get a lot of wind, since it doesn't have a screen on one side. Did you find this to be true? Would you suggest this cabin for all itineraries, or only in certain regions?