inputs.text: never - purchased sennheiser hmec 250 may use airplane little use product started creating loud buzzing noise headset noise could not heard sennheiser headset passengers headsets headset unplugged replaced different type sound gone called sennheiser told problehem probably defective unit offered repair might fix problehem would take 34 weeks said could expedite repairs 50 paying 500 working headset problehem not without product month grade amazon helping f sennheiser bad product bad customer service