Product review (5 stars): They actually work!
These actually work.  They greatly reduce the amount of vibration and noise transmitted by the machine.  However, you have to understand HOW they work...if you stand right next to the machine, it won't make squat of a difference!  What is important is that the distance that the vibration and noise travels is greatly reduced.

I have these feet on a Haier 13lbs. combo ventless washer/dryer unit in my condo.  During the spin cycle on "max" the machine usually shook the entire floor of the kitchen and dining room, and you could hear it outside of the unit with the doors and windows closed.  Now with these feet on, it cannot be heard at all outside nor in the bedroom, and the vibration has been reduced to the point that when I asked my neighbors about it, they all thought I had stopped using it!

Just the solution I was looking for!