I used the DC's at my club for say 10 out of the 12 hrs i've flowen in the C150 . Quite comftable etc . However , every now and then i would miss a word my instructor said , at the end of an hour doing circuits my head would be battered , high noise environment etc .
My instructor actually has hearing loss after all the flights he's done in extra's !
So noise canceling was the ONLY way to go for me. After doing a tonne of research i came across these
http://www.avshop.com/prodinfo.asp?number=5931
basically a rebranded lightspeed set.
Cost me £230 inc shipping and customs charge.
Used them twice now and there are fantastic , i can hear every word my instructor says and my head no longer hurts after an hour or so.
So for almost the same price as the DC's i think they make a much better headset for the £$£$£$ .