I agree with Lou. Many years ago I had a K Mod with trigger and loved it, when I got a Yamaha 734, I put a trigger on it and that worked fine after I got used to the action and coordination needed to get the proper extension by feel, pressure, or whatever. Third slide extensions have always been unnatural and awkward for me. I have never had a horn that you would need to extend the first and third slides to play a C# in tune like one poster spoke of. The first horn I had with a ist saddle was the 84 Strad I played for 22 yrs and the Barrington I have now and prefer to use the ist saddle as much as possible. Many vintage horns are not designed for use with either method.