The majority of the cabins will over-look some support beams, so you won't be right on the edge of the water, but still some nice views. We had cabin 1388 and its on a corner, great views and no beams in the way. Just check out the specific cabin and see if you will have that obstruction. The stairs and elevators are not far away like they are on any of the Radiance class ships, so thats a nice plus. We've never noticed any more movement or vibration being there either..
I was on deck six aft cabin 6362 and loved it. Balcony stateroom, no obstructions. Category was D1. I liked being only a floor or two away from the action. The promenade is on deck 5 and the restaurants are on decks 5, 4, and 3. Casino is on deck 4. I would take the sixth deck again in a minute.