The PA80 seemed to work OK with a GoPro - I've only tried it once so far and the sound is rather loud and a bit distorted at full volume, but at more reasonable levels seemed OK. What seemed more bizarre was the total lack of noise on the recording... In my experience with headsets on its usual to still hear some engine noise, but with the PA80 connected to the intercom and GoPro the only sound recorded was what comes from the intercom - no background noise at all... The recording sounds almost too quiet when there's no talking/communications going on.
Andy