Product review (5 stars): Buy it and be done with it
Picture it: a front load washer on a laminate + underpad laid onto uneven concrete in the basement of my 90-year old house. This thing didn't walk...it ran!
Anti walk silent feet = hasn't moved a millimetre and you wouldn't even know I've got a washer down there any more. If you are on the fence and debating spending time or money trying to jury-rig a solution just save yourself the hassle and buy the silent feet already.