Once a "Pfaffie, always a "Pfaffie", I think is how the saying goes. By the way, The Singer parent company bought both Viking and Pfaff and own all three companies (Viking, Pfaff and Singer) under the name, I think, VMS. And, it is my understanding that the other machines that have the built in foot similiar to the Pfaff IDF are quite bulky and cumbersome and feed in a totally different manner than the Pfaff IDF. Anyway, I'm on my 3rd Pfaff (2044, 2056 and now the Expression 4.0. When I sew on a machine without the IDF, I feel like I'm a beginner at sewing again.