Product review (4 stars): Every little bit helps
I found these on clearance at Home Depot and thought I would give them a chance.  They really seem to make a big difference in the amount of noise and shaking that is generated by the front load washer.  The only issue I encountered was the circular opening on the rubber pads was smaller than the hexagon shape of the washer legs.  I flipped over the rubber pads so that the hexagonal feet would be resting on a fairly flat surface and it seems to have worked well.  The flipside has a type of tread on it to prevent slipping so I hope I won't have any issues with movement since the reverse side does not have the tread.  I think I can honestly say that the noise has decreased by at least 50% or more.  I bought two sets of four since they were on sale for half price because I didn't want the washer to be higher than the dryer.  I used the cushion pads on both the washer and the dryer so they would remain at the same height since the pads will bring your unit up approximately 1 to 1/2 inches.