Product review (5 stars): Holy cow!  If only every product worked this well.
Our washer had been rocking and rolling all over the laundry room.  It drove us nuts. At some point it was going to cause a very serious problem, disconnecting the drain hose and flooding the floor or something.  We tried everything to fix it, making sure it was perfectly level, etc., and nothing worked.

Then I saw these.  They were kind of spendy, $45.  I saw something similar for about $10 and almost got it instead, figuring that if it didn't work it was worth the risk.  But at the last minute I decided, "What the heck, I'm tired of messing with this, this price seems extravagant, but I'm gonna do it on the belief that I'll only need to try it once."

I think I was right.  We just installed the Anti-Walk Silent Feet, then ran a heavy load of wash.  They worked like a charm.  The washer still vibrates quite a lot when it's on spin cycle, but that can't be prevented.  However, the washer does NOT "walk" any more.  It stays in the same place, doesn't move an inch.

This product is a single pad that's made of two kinds of rubber: the upper portion is a harder, firmer, denser rubber (I think it's that way because it's got to be able to support the washing machine feet and therefore needs to be tougher) and the bottom part is a softer more pliable rubber (that I think is that way so it absorbs the vibration and "sticks" to the floor better without slipping).

Yeah, maybe I could have saved $35 by buying something cheaper.  I'm not sure. But maybe the similar product that cost only $10 would have been different enough to make a big difference.  In any case, I am VERY happy with this product and would heartily recommend it to anyone else.