Product review (4 stars): Works, but is not magic
My house is new construction (2009) with the laundry room upstairs.  I have the Maytag 950 front load with the pedestal and the shaking and vibrations during the spin cycle were just too much.  These installed quickly and easily with two people.  Vibrations and knocking are still there, but they are significantly reduced.  Bulky loads like blankets or towels are still somewhat bad, but in general the washer runs more smoothly with the pads.  We also have a drain pan underneath and the feet still fit with some room to spare inside the pan; which was something I was worried about.