The Halo's are great. I just purchased a pair last month and have now used them for about 20 hours of flying most of which has also been with a nasal cannula. They are significantly quieter than my passive David Clarks and much more comfortable on long flights. The audio clarity is amazing and they weigh next to nothing. I also really appreciate the extra headroom they provide (I'm 6'2") over traditional over the head headsets. At 1/3 the cost of a new set of Bose A20s, they are pretty hard to beat IMO.
