Product review (4 stars): Mostly does what it claims to do
Like many people, I purchased a front-loading washing machine that was destined to sit in a mudroom, on top of good old fashion joist and plywood flooring.  This seems to be a generic problem for front-loading machines, as they forcibly move the clothes and water around in a circular motion that causes a 'waving' action by the floor underneath - resulting in a washer that at best rocks and rattles loudly as it washes, and at worse literally begins to crawl and walk along the floor.  I've tried leveling the washer myself and even finally hired a professional to adjust and level the machine, all to no avail.  In desperation I purchased these anti-walk feet (the red packaging, not the green ones) and put them under all four feet of my washing machine.  Technically, I guess I put them under the four feet of my pedestal; in case anyone else is in the same situation as I am, I should mention I bought the optional pedestal for my washing machine (Whirlpool Duet).  This was the first weekend we've done wash since putting the feet in place, and it has made a major different.  The washing machine itself has not budged from where it started, and while the rocking and vibrations can still be felt and heard in the next room, it is much MUCH better than it was.  Hopefully they will continue to perform like this in the coming weeks and months, but even though these suckers are fairly expensive I think they were well worth the price in my situation.