I used to have an old treadle sewing machine. Also had a couple of the old Singers in the cabinets. My mom refuses to sew on anything but the old singers but they have to be electric these days because she can't work the treadle any more.
I try to collect, those that are different from the others I have. I stay with Singers and Whites. I have treadles, table top, coffin cases, and different advances. I have some that have an electric motor, but they are the ones where they just strapped a motor onto the top pulley. Whatever that is called, that turns the needles with your hand.
I really just like the different cases and stands wood types etc. I try to not get any tow that are alike. Right now I am not allowed to buy anymore. However, if I saw the right one, I might forget I am not allowed to buy anymore.
My mom's favorite for years was a Singer treadle that had been converted with a motor & pulley but could still be used with the treadle just by switching the pulley.