I have used the Sennheiser 400 series for the last five years in a very noisy twin and it is excellent, reduces background noise, improves coversation over the intercomm and makes general r/t much easier. Even when worn for over five hours at a time it seriously reduces fatigue. I have compared it to a Bose and actually found it superior at a lower price. The Bose was fine but gave up at take off power.