I use the Bose A20s on the MD-11 internationally. They make a huge difference trying to understand some of the controllers, and also with HF checks. Money well spent.
I do carry classic Bose ANC headphones for deadheads as they are a lot more inconspicuous.
Worth checking some of the airline mileage deals for the purchase. I got 15miles per dollar from United. Helped with the price sting a little.