Product review (5 stars): We're very happy with these!
Put a set on the washer and dryer.  We have LG Front loader washer.  These have significantly reduced house vibration.  The dryer is even quieter.  The washer will move a bit more on the pads, but nothing crazy.  I recommend that you always use these with the washers "Spin Sense" turned on, if available, as it really adds to a quieter spin.