If money doesn't matter the Swiss Zigzagger will work as a walking foot. Neither of the others do. You easily switch between zigzag and straigth stitch while it's mounted. If you have other things to spend money on, go for a regular walking foot made for the old straight stitchers. It cost less to get a 401 up and running and buying a slant shank walking foot than the Swiss Zigzagger itself. If you are lucky and find the zigzagger some where at a reasonable price, grab it, but I haven't been that happy with my zigzag attatchment. I have a more common large black zigzagger, nothing special. The same for the penguin walking foot, it's priced as a collectors gem, not really for the average user. If you really want one its' all right though, they aren't impossibly expensive.