Comfort: Having a head XXL. (I measure 2m ...) I have to put the helmet to the millimeter to not have pain ... If I move or if I put glasses. it becomes a torture device ... Otherwise it goes. I lose the mobile side. Too bad!
it greatly change my headphones Sennheiser HD 515 (but this is the hifi too).
Sound: Great: As much on my mp3 player on my pc connected to a Usb.Il dac literally explodes my Sennheiser that sounds too flat by comparison. It is not recommended to test these headphones on an integrated sound card. The sound will lack depth;) Having a test bose 300 euros. The Philips may even compete with it. This is the strong point of the helmet and in all styles !!!
Strength and functionality: Frankly, it solid and air it breathes seriously. I have a hunch that this helmet will last long. The 2 cables with thick and are interchangeable. I love !!! Tips also notched the setting for adjusting the helmet properly.
Soundproofing: I hear what is happening outside if I open the window ... But it's okay.
Conclusion: A buy eyes closed to people not having a head unconventional like me;)