So far, so good. I've only had it a few days and used it a handful of times. But I did wear the headphones for an hour straight and it was very comfortable and didn't give me a headache like over the ear headphones in the past. It's also very lightweight. The only reason for the 4 out of 5 stars is I haven't used it for airplane travel yet. My hopes are that the noise canceling feature will be able to drown out the jet engine noise and loud conversations/kids crying.
Great pair of headphones. Very stylish yet very comfortable. Lightweight too. The only drawback would be that you cannot turn the noise cancelling off unlike its predecessor QC 35ii's. Overall, a really decent pair of headphones.