I had a DC 10-13.4 for almost 20 years, since my college days. I've been using an A20 for the last 5 years since the wife decided I needed an upgrade for flying professionally. One day I forgot my Bose at home, but had the DC in the hangar so I thought what the hell. Forgot how much difference ANR makes. I've definitely gotten spoiled, and won't fly without it anymore.