I felt a "shudder" once or twice, but overall I must say that this was the smoothest cruise I have ever been on. Much of that may be due to sailing on the Adriatic vs the Carribbean or the Pacific, but still, amazingly smooth. One crew member made the observation that this is also a side effect of being a new ship, very little growth (barnacles, etc) on the hull. That seems to me like a small factor, but I'm not a hydrodynamics expert. 🙂