I have used it in the one machine that has that function, just to see what it is like. It was fine. If I had to I could get used to it. I think most of what we do is habit. I have some vintage singers in a cabinet that operate with the knee lever. I also have a knee lift on one machine. I don't go back and forth but I think it would take some practice on any of my machines if I am used to some
other one.