In 07 we stayed in 6454 on the Glory, which is a Conquest class ship. We loved it. To me there seemed to be a bit more vibration. This did not bother us at all. The only issue I had was that the Karioke bar was right below us. You could hear the music until late at night. That being said I would book one again without any reservations. The view is great. At night it is protected from the breeze, so it doesn't get as cool in the evenings. If that is the type of cabin you booked, you will love it. It would be hard to go back to any other type of cabin. We have one of the new aft (8M) balconies booked for our upcoming B2B on the Ecstasy next month.
I am sure you will enjoy your cruise.