Product review (5 stars): It really works!
We were skeptical but it really works!  We have an upright HE washer and dryer both on pedestals and they would vibrate and walk a lot.  These have helped tremendously!  The floor under the washer does not shake at all!  It's great!  Previously we always felt like an airplane was taking off when the washer was on the spin cycle but now that's not the case at all.  The washer itself still shakes but it doesn't shake the whole house.  Yay!!