Product review (1 stars): Did not reduce vibration for washer installed on an upper level
We tried these along with a lower priced option and neither worked.  The vibration was actually worse, likely because the center of gravity is raised slightly.  Our HE front loader is a 24" Ariston model, but it is installed in a closet on the upper floor of our townhouse.  There are no structural improvements in the floor underneath and that may have contributed to the lack of reduction in vibration.  We are moving our washer to the main floor where the floor is concrete.