Are you referring to the Jones rotating under lever? If so they are slower to operate, some do it quite well. But they are one of the strongest fastening systems ever used.
There are other types of under levers. One is a push forward and the other is a pull upward operation. I had a Adams with a push forward lever that I liked both the styling and operation of. Unfortunately the barrels were paper thin and they had stopped doing the Teague lining by then. Lovely brown Damascus wall hanger it was with barrels less than .015, one spot just about where my thumb and finger would rest.
Side levers work quite well if you come across one take a good long look at it.
