Product review (5 stars): Actually, really works, even on large, heavy washers
We had just purchased a new washer and dryer set.  It is a HE washer, but still a top loader.  But it has 5.3 cubit feet capacity and is HEAVY, with intense spin cycles.  Yet despite being so heavy, it still walked during the spin cycle, and was impossible to move when full of heavy wet clothes.  Pretty hard to move even WITHOUT wet clothes.  Even hubby had trouble moving it.  So it wasn't just a matter of nudging it back in place like with the old washer.  Hubby researched and decided on this set of rubber feet.  I was aghast at the price, but we bought two packs (decided what the heck, let's put it on the dryer, too.)  Needed our brother-in-law to come help install, it's not easy with large/heavy machines.  And once installed, there's NO moving it, so make sure it's already exactly where you want placed.  So far have done three loads, including one with heavy bulky bedding, and we were pleasantly shocked to see that the washer stayed in place.  We had put taped markers in front of the feet for visual confirmation, and the washer hasn't budged at all.  We are going to continue to leave the tape on the floor to see how it looks after a month or so.