) This system does seem better that older suction cups that you just push on. Si lo que buscas son horas largas de audio no son recomendados, si los usarás para ejercicio, correr, entrenar, son una excelente adquisición sobretodo por su sonido (y más si los encuentras en descuento como en mi caso). No shoe bite for those tiny feetUpdate-So it’s been 3-4 days my son has been using them and he seems pretty comfortable walking in them. Overall, for the price and quality, I would buy again! Would highly recommend this! Fue un regalo y le encantó. I trust Merrill brand shoes. Because I am graceful as well as coordinated, I promptly tripped and stepped on the case and one of the ear pieces. it seems that I will loose them at anytime and walking with them, I have to kind of force my foot to position in a certain way to avoid to loose them Rubbish stuff! but now agrees cost was worth it.