A walking foot for less than the cost of a bagged lunch. Of course, it's Amazon and it's Prime. For under $6 it was delivered on Sunday in two days. What's the catch? How about none. It works and I did take one apart, to adopt to a slanted Viking, and the quality in better than good. I was expecting a dollar store product. If I paid $30 for this I would still be impressed. If you don't see it on the Prime list keep scrolling. I thought it went away but had moved down the page. I get nothing but chuckles from this video. Hay I'm 67 doing sewing video production. That's worth a chuckle. Enjoy.