Already several weeks of use, and I must admit I am very satisfied. I was looking for basically a gaming headset, but considering the price I pulled this supplement solution Bose AE2 my helmet. The voice is captured correctly even with the microphone on the chest 10-20 cm below the chin. No sensitivity problems unlike most reviews on Amazon.com. Have a look on Amazon.com for reviews (in English) or better on Youtube, which features of this micro test videos. I think most of the bad reviews come from poor sensitivity adjustment (Skype, choose "Automatic Sensitivity") or the sound card (look in the audio settings).
To: - Prices, ridiculously low. - Really good audio quality for a microphone in this range widely enough for Skype. I have not tried with other VOIP software, but some tests with Audacity convinced me of the quality of the recording.
Against: - Reproach often made product: the clip is too large for most headphone cables, but easily correctable by adding thickness over headphones to the desired height with tape or sticky fabric or thick paper inside the clip.