I FMQ with my Singer 15-91's and 201-2's, also on my Necchi BU Supernova machine. I have more than 20 vintage sewing machines and haven't had a chance to try all of them yet for FMQ. I've tried my 301's but haven't had much luck with them, although I've heard others say they love them for FMQ. I don't know why some machines work well and others don't. I do know the bobbin case has a lot to do with it.