Weapons_Hot: That really surprises me, ATC hasn't complained one bit so far, and neither have my fellow pilots - there really shouldn't be any feedback at all if the headset fits properly - and how could there be? The microphone picks up the vibration from the jaw bone, a feedback loop can only exist of the mike is 'open' and doesn't sit tightly in the ear/on the bone - or not?
For the record, the thing
does have TSO-C57a and C58a approval.
(Excerpt from the manual)
The tbone aviation™ headset model 258260 with its three subparts 258261, 258265 and 258269 are approved according to EASA ETSO-C57a & C58a and
FAA TSO-C57a & C58a