Product review (5 stars): It works!!!!!
This product works. We have a 9 year old house with a second floor laundry room. Over the years the vibration transfer through the floors has gotten worse. My floors squeak and pop, especially when it's cold and it's gotten worse and I disagree that it is a result of "normal settling".  Anyway, I installed these tonight and I no longer have to lay awake in bed feeling the vibration imagining the house falling apart at the seams. Best $26 dollar investment I have made in the last decade!! PS - I have tried tennis balls, towels, a rubber mat, increasing and decreasing the size of the loads.