It depends on the machine. For my 5.5mm stitch width Berninas, I love the #37 foot. For my 9mm Bernina, the new 97D is fabulous. I also like the Pfaff 1/4" foot, which I use on my Baby Lock Quest Plus and on my Pfaff Select 3.0. The Quest Plus was a "twin" machine to a Pfaff model, so the feet are compatible.