I have used this product for my first running outputs in mid-December 2010; Two weeks later, the sound is intermittent at the right earpiece; since mid-January 2011, the earphone in question becomes completely silent. It is appalling to see that the sixty review available on this product, more than 15% mention this failure after a period of use between a few days to 3 months! The manufacturer, Sennheiser, can not ignore; so how can he continue to bring to market a headset with such a failure rate !!! Potential buyers will understand that with such a purchase, the probability of hitting a non-compliant helmet is unacceptable, even for the less demanding clients ...
