I have my own Sennheiser headset, more for personal hygiene than anything else, I suffer with bad Psoriasis of the scalp. I have not yet come across this idea of wearing both earpieces in regular flight. I have used it when trying to reach some far away station on HF, Dakar anyone, and bad ATIS, but on the 737's I have flown (300, 400, 600, 700, 800, currently 400 and 800) there has never been a issue with noise in the flight deck, maybe someone is trying to make money out of us?