Bought the a Telex 850 and returned them after 1 trip. Bought the DC's next. MUCH better. They work great. I have had 2 planes where I got some loud feedback when I tried to transmit. My FO had the Bose/Uflymike on the last plane this happened on and I swapped headsets with him and sure enough, I could transmit with his just fine so it wasn't a radio issue per se. But 99% of the time the DC's work very well.