Product review (4 stars): No perfect, but....
They definitely cut down on the racket coming from our front-loader.  I have been annoyed by the noise our washer made from the minute of that first spin cycle., but then, we renovated our laundry room and replaced the vinyl flooring with ceramic tile, and WHOLY GUACAMOLE!!!  The hard surface floor cranked up the volume beyond imagination - even closing the door didn't help.  Like others, I figured, "what have I got to lose?"  Amazon will refund if they don't work...but they do work.  My washer didn't walk prior to installing these pads, but it definitely vibrated, but the vibration is much less now, resulting in about 50% less noise.  I also put a rubberized pad (the kind made to cushion your footing on a concrete floor) under the washer, as well as beside and behind it, and I think that also helped reduce the noise level.  I will absolutely keep these pads, as they do make a difference in the noise, however, like others, I also feel that they are overpriced