I ordered two of these. One worked -- some hissing, but usable and comfortable. The other did not. I called Sony and received a return label by email, and sent it back to them. It has now been in some service limbo for more than a month. I have received an email request for repair charges (it never worked!) that exceeded the purchase price. When I called Sony back they indicated that this was an error, but they have never shipped the replacement. I spent two hours today on their customer support line (not toll free, by the way) but never got anywhere. Ultimately, the call passed their magic quitting time, and they then told me to call again tomorrow.Their support structure is dismal and disorganized. If you get a working unit, fine. If not, you would do far better getting something from some other company.