I agree with Kat 2 that the vibration is still there although it did not bother us. I do believe it has to do with where you are seated both in the show room and the Compass Rose. It seemed to be worse at the front of the showroom on the floor but if you were up in the balcony it was not really bothersome. I also agree about the middle rear location in the Compass Rose and we always avoided sitting there. It was most pronounced when we were crossing and the ship was under full speed. I think I was home for 3 days before that constant hum and vibration finally left me every time I closed my eyes but I did not find it overwhelming enough to effect my over all enjoyment of the cruise......which was fabulous.