Here now when I am acquiring this helmet (purchase 11/08/2009), and I do not regret having bought. I use almost only with my iPod classic (with a Bluetooth stereo adapter) and the sound is of high quality. The bass is present goods contrary to what one might think. In addition, when connected to the ipod, no need to adjust the volume with the ipod but only with the headset. I still tried with my iphone and it works perfectly (it is immediately recognized by the iphone).
Strengths: - Ease of use - Practice with the audio wire provides in case of failure - Charges via the adapter supplied with (or with a USB port) - Some up to 17H autonomy
Weakness: - Bluetooth connection is very greedy in battery, so the battery of the iPod iphone and emptied a little quicker, but hey it's worth it ...