Hi
We were on 4/6 7 day cruise in 8558 which is a floor up in the middle. Let me tell you...lots o rocking on that ship esp the first 3 days. I am prone to sea sickness, I took my bonine 24 hrs before and during the cruise and still managed to get sea sick at Palo's brunch no less! I spent about 48 hrs mainly laying around in bed and taking naps which helped.
Things calmed down by Tues, but I think bottom line you can get sea sick anywhere. The problem I ran into is that the places you eat dinner except Lumieres (which guess what was the last in our rotation) are in the back of the ship including, Palo's, Animator's Palate, Parrot Cay, and in the front of the ship, Topsidders...all of which had lots and lots of rocking. It got comical..people running into walls. The cast members said, this was a bad cruise, but not the worst by far.
Just be warned!
Amy