Product review (5 stars): Exceeded expectations!!
Put these under our Kenmore Elite High Efficiency Washer (Model 796.2927200) and Steam Dryer (Model 796.69272000) on a tile floor.  The washer in particular made quite a bit of noise and walked a lot during spin cycles which is to be expected with any machine on a tile floor.  These Anti-walk Silent Feet are working exactly as advertised.  The noise has been reduced by at least 50% and the washer doesn't budge during spin cycles.  We got two sets so the machines sit at the same height.  It definitely requires 2 people to install them and my wife was easily able to help.  I have and will recommend this product to others.