Interesting features, but poor audio quality

I bought this headset because I wanted a practical headset for the car, and to use the voice assistant SIRI on my 4S. At first glance this headset is extremely nice: pretty, light, like to the ears, to me following a spectacle wearer, it was very convenient.

The feature "hands free" (we say "answer" or "ignore" to make or cancel a call, handy when you have your hands full) Plue had me immediately.

However, the audio quality leaves something to be desired ... it sizzles, and my callers hear me wrong. In addition, because of this poor quality, SIRI misunderstands what I ask him. Yesterday I wanted to dictate a text message, after twenty attempts there was always a word that not understand. I then took the phone in hand, I dictated my SMS and there he understood immediately.

In short, dissatisfied with the product, back underway ...