Product review (5 stars): Wow...works well!
We were skeptical when we bough them but they work well and we are completely satisfied!
But to clarify things a bit, they won't stop your washing machine from shaking.... what they do is to stop the vibration from being transmitted to the floor of your house.
So the machine shakes, but the house doesn't (as long as the body of the machine doesnt touch a wall).

Worth every dime! We wish we bought them 5 years ago when we got the washing machine.