Product review (5 stars): Works very well - I'd say 85-90% vibration drop
Our front loader washer in sitting on typical sheet linoleum. It walked all over the place on any spin setting above medium. These anti walk feet work really, really well. Washer can now be used with towels and set on the high spin rate setting without concern. The washer still shakes a bit but it doesn't move anymore.

They're stupid expensive for what you get (they're basically high end furniture cups) but they do work. $20 for them? Perfect. $40? Expensive but no other real choice. And they work.