Hi Pat, I have a Pfaff 2056 with a built in dual feed (walking foot). I use my dual feed on almost everything I sew. Pfaff was the company that invented the "walking foot". On the Pfaff machines the foot works in forward, backward and sideways when using decorative stitches. It also works with any stitch length. If you have a different kind of machine you have to use a walking foot that is not built in. The limitations of these feet are that they are large and bulky and you have a hard time seeing what you are doing. They also generally work only going forwards and with a 2.5 stitch length. I wouldn't give up my Pfaff for anything!