I really like sennheiser because they sell quality product at reasonable price . these headphone be no exception . I get it at $ 21 , which be a steal . the sound quality be almost as good as a $ 70 pair of headphone I be use before . when compare these to bose QuietComfort 15 acoustic , the bose be noticeably better . but , I pay $ 21 vs. $ 300 it cost for the bose . my only complaint be that these headphone have the bass frequency slightly increase . I be from the old-school and do not believe in use a equalizer or change the frequency . regardless , these headphone be great . and to truly enjoy they , use they to listen to you favorite cd -lrb- mp3 will do these headphone no justice -rrb- .