DL's used to be the smoothest, and probably will be again. I rode it the day before they closed it this past April and at that time it was the roughest ride I had ever been on at Disney. It seemed a lot jerkier than I remembered it and by the time the ride was over I felt as if I had been beaten with a baseball bat. I was glad that was our final day at the parks because I felt terrible the next morning. When we got home that night, it was all over the internet that SM had closed suddenly. It was kind of scary speculating what might have been going on while we were riding it, and how close we might have come to what eventually happened at BTMRR.