Product review (5 stars): These feet actually work - so far.
My new Kenmore front load washer vibrates bad when it ramps up to spin speed. Always has, since day one. Even empty. It walks across the basement floor almost every load. Up to a foot out of position. 5 visits from the Sears Blue Crew: you use too much soap (?), the floor is sloped (it's a basement! with slope to floor drain), the floor isn't clean. They eventually had a new drum delivered, then warned that this one could be even more unbalanced. No thanks. Then they advised put adhesive backed furniture pads under the feet. The washer walked out of the furniture pads. Awesome washer and awesome service.

Yes, the anti-walk feet are somewhat expensive. But with more run time I'd be inclined to give the feet a 5. They seem to solve the walking washer. My initial concern was that the washer would walk out of the anti-vibrate feet. After 3 weeks this has not happened yet. The washer still vibrates a lot, but the feet absorb it, and the washer hasn't moved.

Update: after 3 months the washer still hasn't walked. These feet work. 5 star.