I use a Singer 15-91 with a vintage Pfaff foot that I found one day in a sewing machine drawer. It fits it perfectly, it was meant for darning I guess. I also have an old industrial 31-15 Singer that I use if its a really big quilt but its loud and it makes me nervous, I purchased a zuki industrial fm foot for it and I keep it from vibrating loose with a dolop of JB Weld. The 15-91 is my favorite, don't know what it would be like to have a fancy quilting sewing machine...