We were there in April of 2002. It is a very smallish store compared to the one they had at SOG. It is really just hotel-room size, or a little larger. They sell a few t-shirts, snacks and trinkets. If there was no Armed Forces salute, or if you need other tickets for area attractions at a discount, you can get them there.
We really didn't request a particular room when we went. We were on the second floor and we did have a long walk down the hallway and then a long walk to the monorail with two little ones. I would think first floor would be more convenient. There are only a couple very tiny elevators to the second floor. You would not want to be near the door leading from the tower into the NGW, though. One elevator is right inside this door and I can't imagine the noise those people put up with day and night what with people coming and going there.
Ten minute walk to the MK gates. It was great!!