Very good efficiency, excellent price / quality ratio, beautiful design. Against a little too big for my taste and no specific setting. Leaving aside the price (cheap too) and I compare it to other headphones (much more expensive) I owned already, I can only put it 4 stars, 5 stars being perfection. I still highly recommend this purchase, it was worth the money, remains to be seen longevity pads that tend to deteriorate quite quickly earmuffs and stiffness of the attachment system / slide adjustment "wire type iron "that which does not convince me completely. That said, the price is related to the design, one can buy more with the money to put in the most advanced helmets, flying the in terms of aesthetics, settings, robustness, but not level of sound protection that a priori is the search order.
