Product review (4 stars): seems to work
I guess the best thing I can say about these is that since I installed them I forgot that I had a problem with the washer! It really didn't vibrate all that often, but when it did it was very loud and obnoxious. Since I put these in a few weeks ago, I have yet to hear my washer vibrate. However, they were very difficult to install for me because my washer is between the wall and my dryer and it was impossible to get them on the back feet.  We ended up buying a pan to put the washer in and then putting the washer on it. Then we put the Silent Feet under the legs and slid the whole thing back in to its spot. Overall, I'm happy!