I have an old Pfaff and a newer Viking. The old Pfaff has a built in walking foot, which is really great. Not nearly as bulky as the attachment walking foot for the viking. The Viking has a needle down position (always stops with the needle down) but the Pfaff does not. Both have a built in needle threader which I love. I also have a single hole throat plate for the Viking. This is great for piecing. It would be nice to have all of these in one machine.