Funny you should ask. A friend told me about a gathering of treadle and hand-crank enthusiasts. I thought it would be like a quilt show or exhibit but it really was a gathering of about 15 people. They had several machines there to try out, one being a treadle. I own a 1951 hand crank and have always wanted to try the treadle.
Long story short, my legs are too long for these nachines. I did manage to sew a couple of seams, after getting the rhythem (sp?) right, but only after some contortions. So, no, these are not for me. I'll stick to my un-treadles. :-)