Sonically you need not argue about the Sennheiser MM30i, convinces the set with a balanced sound, high volume and a pronounced versatility. In the application, however, the MM30i shows weaknesses and refused to for example to current Android phones his service (control and micro). In addition annoys the position of the control unit, much too close to the ear, this it can not be really "blind" control. The Sennheiser then saves to a carry bag, has led me to exchange the set again.