I have a couple of old singers, my Grandma's. my sister's ex hushband's Grandma's featherweight (get your head around that!!) I have an old Singer treadle too. I used to have lots of others but ran out of space!
I love the sound and the history - like the other guys said. I dont use mine though - I love my Bernina's with a passion, PASSION!
But I still love to look at the old ones and turn the handle and hear that sound.........