Monash University student Michael Walsh recently conducted a study of those who used PMDs on trains. While some said it helped to escape the noise of the vehicle and other travelers, non-users sometimes resented them because the user “fails to communally experience the aural soundscape.”  The report also said that although most of the PMP owners realized that they could damage their hearing they wouldn’t give it up. They might want to think about that one. Those of us that attended rock concerts years back that had the same warning didn’t listen either.