Product review (3 stars): Worth Doing
The product is well made and was easy to install on the feet of the refrigerator.  I gave it only three stars because in my case it only reduced noise an estimated 15%.  However that degree of quieting was definitely helpful and I would do it again..  Depending on the noise source inside the refrigerator (compressor, fan, etc.) the type of construction of the house and location of the refrigerator I'm sure results vary.