Product review (4 stars): Helps a lot, but does not completely reduce the Samsung crack and bang syndrome....
Quality high density foam rubber foil faced product.  Peel and stick.  Not giving it a 5-star as it seems under-sized for the location and it's purpose --to insulate the cooling coils from the molded plastic interior of the refrigerator to eliminate loud cracking and popping noises during defrost..
  The mat has reduced  the constant banging that was occurring during defrost cycle's, however it has not completely stopped them.  If the mat covered a larger area behind the coils (which it easily could), it would have totally eliminated the problem.