Product review (5 stars): Does what is promised!
We have a second story vacation condo and purchased a stackable front load washer and dryer about a year ago.  As much as I love front loading machines, I was amazed at how much they vibrate when spinning.  We've had a front loader for years at our house, but it's on concrete in the basement, so I've never experienced feeling motion from it.  Since we try to be considerate neighbors, I found myself only willing to do laundry when our downstairs neighbor wasn't home so as not to subject her to the noise and vibration of the machine.  I finally decided to find a solution and stumbled into Silent Feet as a solution.

We installed a rubber mat and the Silent Feet under the stacked washer/dryer and holy smokes, what an enormous difference it made!!  Not only is there almost no vibration (whereas before you could feel the whole floor move), but I found myself checking to make sure the washer was even on because it was so quiet.

I'm so happy with these that I started calling them "Happy Feet" because they make me so happy!  I recommend these highly to anyone who has a front load washer on the second floor or not sitting on concrete.