I used DC 13.4 for about 10 years whilst flying Piston and Turbines. They are a good set. Ruggered and tuff enough for dozen sector bouncing of Australia everywhere. I had a Telex set before this (15 years when they died). They were lightweight and comfortable.
After my set was about 5 years old, I sent them to the states to get the mic checked out. They replaced the mic, replaced the metal as it was a bit rusty and put new gel seals and covers on them. All for FREE! (cost postage)
The customer service is first class, the headset is a good no frills, cheap and reliable headset.
You can put a liitle more foam in the cups to make them quieter.
Not the fanciest, but take some punishment