Product review (5 stars): Let your washer go into hyperspace and don't take you with it
Whether or not these pads work for you seems to depend on your specific washer model and floor situation, so I'm giving you my setup: I have an LG washer/dyer combo unit in a pre- war Manhattan walkup. I did not have tremendous vibration problems to begin with, as the washer sits close to a load- bearing wall and I wouldn't dare let it spin on High. Still, on Medium the floor would vibrate and the items in the fridge next to it would rattle. I figured that couldn't be good for the building or my neighborly relations.

Enter the Silent Feet. I didn't expect much after reading another reviewer's verdict with his LG combo unit. But, in my case, the appropriate word is "wow". The vibrations are gone! Everything is serene in the fridge again and if I close my eyes and stand next to the washer, I can barely tell that it's spinning. The machine is just shaking away by itself (a lot more so than before since it's no longer connected to the floor) and it actually becomes blurry at 1200 rpm (20Hz), like in a SciFi movie before things disappear into subspace.

Oh, and forty bucks - it seems a lot for some rubber pads, but since the product worked so well for me and they give 10 years warranty, I think it's fair. Also I had looked into an industrial solution before, but dropped it after I realized that those pads or mounts easily go for $400 - a piece!