I bought a set of DC ENC headsets about tow years ago. THe ANR never worked just right but I couldnt go without my headsets long enough to have them troubleshoot them. I went on vacation a month ago and while I was gone I finally sent them in. Not only did they fix the noise cancellation, they replaced the gel seals, foam pad on top, installed a new microphone and cover, installed all new meatal hardware and replaced the battery pack, all at no cost. I didnt send them a scrap of proof pf purchase and they returned them to me within 5 days. My advise is purchase the ANR now, don't do anything that will void their fantastic warranty.