I had DC 13.4s during pilot training, all good. When I became an instructor got some DC 13x's with noise cancelling, and they were great. Sold them after finished up with instructing. Came back to instructing after many years and went looking for more ENC DCs but ended up with Bose Aviation Headset X and will not go back. No more slimy green for me, and also I got some free Oakely sunglasses with the Bose, not to mention that the Bose headset actually came in a little cheaper than DC. Its only time before Bose bring in an 'entry level' model and wipe the green slime clean away.
PS I was a huge DC fan in the past.