haven't used it but wouldn't you rather have a deer specifically come to a place because they smell something than mill around anywhere smelling nothing. i think if I were a deer and something was impeding my ability to smell, (a main source of protection) I would be nervous and defensive. and what if the deer are feeding? does that make acorns or beans or corn or whatever smell like nothing? i think that would make them think something was wrong as well. I feel like if a deer couldn't smell in a certain place, they would go somewhere else where they would feel safer... just my opinion. seems like gimmick to me.