Product review (5 stars): These Work Well, and a Tip for use
These feet work really well to damp the insane vibrations of front loading washers.  Our house used to shake when our Frigidaire washer would spin up.  These things reduced the vibration to almost non-existant levels.  However, there is no free lunch, here's a couple of observations and tips:

1)  The noise level of the washer is now higher.  Our laundry room has a tile floor and the small gap under the washer acted to muffle the internal noise of the washer.  Now with an additional 1+ inch gap the washer noise is more noticeable.

2)  The vibration of the washer is now taken up by the springy sorbathane feet.  But the top of the washer can now rock more than it could without the feet.  Our washer and dryer have the pedestals, so the tops are pretty high (there is a long lever arm for the rocking motion).  When the washer is rocking during the worst speed on the spin cycle the top moves about a half inch or so in each direction.  This means that we had to have an inch or so between the washer and the wall and the washer and the dryer.  If we didn't, the washer would bang into the dryer as is maniacally shakes.  So be aware that you may need to give your washer more breathing room than you did before when you use these.

All in all a good purchase, and well worth the price.