Product review (5 stars): Love these...
Purchased one set when I purchased my new washer (and dryer) which are located on the main level of my own.  Vibration and noise have always been a concern.  Loved them so much I purchased a second set for my dryer.  Not only do they work, but they lift the units up enough to allow me to clean under them any time I want!!  No more pulling my washer and dryer out to clean under them - in a very tight space - and using a lot of energy and time.  Buy some.  I don't think you will be disappointed... especially if your appliances located on the upper levels of your home.