I'll give it a try IO, but it will have to be very very good to justify the huge price tag on it.
With a headset, the protection to ones hearing is actually the attenuation of the loud noise environment within the cockpit or anywhere else for that matter, by good quality ear seals on the cups of the headset. Ear defenders worn in industry work this way too. The ANR headsets work by sampling the background noise and then inverting the main waveform and playing it back into the ear cup to cancel it out, so as far as protecting the hearing is concerned my old HM10s probably do as good a job. But of course if one removes, or partially removes the background cockpit noise, then one can hear Air Traffic, or whoever it is that much clearer and this is where these headsets score over the rest. But let's not forget that Air Traffic are no "Classic FM" and none of them transmit in a digitally clear HD radio quality, so if the controller is using a scratchy old radio set and a lousy microphone with plenty of background noise in the tower, the posh and expensive headsets are going to be of little use. As the old saying goes.... "You can't polish a !!!!"