I've been using a treadle machine since 2007 and I can sew at a pretty good clip when I'm sewing long straight pieces. I have my right foot slightly ahead of my left. I can treadle one footed, have more control with both feet. I have 2 Singer cabinets and 1 Franken-treadle. I prefer the Singer machines. One of my machines is a 237 zig zag very easy to use.
You can see some of my machines in my Webshots albums. The White VS-III isn't sewing yet.
Sharon W.
http://www.webshots.com/user/purpy102