I bought second-hand DC10-40s about 15-20 years ago and fitted an ANR kit (with the PP3 battery clipped to one ear-cup to avoid dangling cables and boxes). They have worked faultlessly, have never fallen-off in aeros and the ANR is great in noisy twins and aerobatic aircraft.
(Edited to confess that before the DC10-40s I had an Airlite 62
)
HFD