I'm seriously considering investing in one of these for my future pro civilian flying. Currently flying with a pair of DC 13.4 in my private flying, so something lighter and with a smaller form factor would probably be desirable in an airliner. A lot of people don't understand ANR and assume it effectively attenuates across the spectrum. It doesn't. The fact is that ANR leaves a lot to be desired in the high frequency range, and the passive attenuation rating of ANR headsets is horrid, let alone the airline style on-top-of-ear setups, which effectively provide zero passive attenuation.

I think people really underestimate the damage going open ear in an airliner like a guppy poses. Some of the research I've read on noise levels in the more common legacy narrow bodies outright surprised me. Anybody who believes these cockpits are quieter than 85dB (industrial threshold for permanent damage based on a "work day" worth of exposure) on a sustained basis are deluding themselves. I certainly recognize the dependence on medical fitness this job poses to putting food on the table. Anything one can do to extend that sports-like career run is money in the bank, at least on those items you can control. Hearing protection certainly falls in that category for me.

For reference, a full-enclosing cupping style headset like a classic passive DC has circa 24db of attenuation. An in-ear solution like the foamies people use in industrial settings (or us helmet wearers the military), comes close to 45db of attenuation, which is about what the Clarity Alofts advertise (30-45dB depending on internal ear fit). At that level of attenuation, ANR considerations are moot in the first place.

I'd assume similar performance out of similar headsets of the same style (QT Halos et al).