Product review (5 stars): Return to sanity ...
Placed these under a w/d combo on fortified wood floor and am no longer afraid of being chased by out of control machine. The vibration issue has also improved by at least 80 percent. Things aren't perfect, but the difference these Silent Feet have made has brought a little sanity back to wash days. And yes, the machine was checked out and I was told (months after installation) not to install it on a wood floor. (I'd asked the specific question before purchasing. Go figure .) Thank you, Silent Feet!