Product review (5 stars): As promised!
Our home was built in 1774 and I thought my HE front loader on the second floor was going to have to be replaced with a lower rpm spin speed top loader.  I said to myself this product can't fix a 240 year old floor...or so I thought.  Once we got the pads in place, I loaded the washer with towels and sheets (fitted sheets that are guaranteed to wad up the towels and shake) and let her rip.  The washer still had a minor visible motion, but the vibration and walking had stopped.  My wife later ran a load of towels and sprinted into the laundry room at the sound of a buzzer assuming something was wrong. The buzzer was the end of the cycle alarm.  She was surprised to realize she did not need to lean on the machine to keep it from shaking the house.  It ran the cycle without us hearing or feeling anything in the rest of the house.  Make sure to get a second set for the dryer to keep them even. Be sure to level the feet as well.
Pricey, but effective!!