the headphones are great, however a few issues that i had..... 1st pair, left speaker phone in-operative after 3 weeks use, 2nd pair, left speaker in-operative after 4 weeks of normal use. only other comment (not complaint) the comfort zone adjustment defaults automatically to firm, and will not stay on the light adjustment. great speakers, poor design and manufacturing. companies like koss, do not like constructive, input, but I'll give them another try. after all, i live in Moog-ville, NC ,aka Bob Moog(god bless, r.i.p.) aka asheville, NC, former home to bob moog and current home to the moog museum and moog-fest and of course...asheville, nc ...music capital of the carolinas. peace. love and joy.... btw, Amazon has been wonderful to deal with regarding my returns and replacements, that's why i continually shop Amazon, not walsmart or k-art or targot or bust buy. Shop Amazon!