I'm not a specialist but of all the headsets that I have purchased (maximum 50 euros), they are the only ones that give me the impression of hearing a sound balanced and comprehensive. This is really a stroke of heart on that side, and they are also compact and discreet, and frotement cable does not generate noise. I can not judge the quality over time but for the price ... The only complaints I have: head jack bent at 90 degrees, the absence of joint that helps tighten the cables under the chin headphones. Note that adapters of different sizes are provided for the ears (s, m, l).