I bought the N6 in Nov of 2008. They went on a few airplane rides and now they don't work. They didn't reduce the noise level very much. Its white noise that it produces is way too much background noise. It hardly canceled any noise on an airplane. They are still in warranty but get this. Sony said its a 24$ exchange fee. So you pay shipping to get it there. I paid 30$ to buy them . Forget this unit and pay more and get more. Like something that actually WORKS.