Materials and build quality seem to be on par with the Keen reputation. 5Qualità Audio: 9Ottimo prodotto da parte di Sennheiser. The straps are roomy no cutting in on lil fat feet. Despite mic volume adjusted to the max, my contact could not hear me properly. To be expected, but using voice prompt to skip 30 seconds was better on the Buds. It?s easy to put together. I then called their 1-888 support number and the first thing the automated message warned me was that I risked being charged a $9. Look and foam bottom are about the same. ) I have never neglected this system in any way, and one day, recently, it just stopped working. Muy comodos, yo uso una almohadilla M y otra S.