I converted my DC's as well but am not 100% happy with them now. Sure they work great, but when you do the conversion you are actually removing some of the foam padding to fit in the noise cancelling gear (mic and extra speaker). As a result when you battery does go flat you end up with an absolutely useless set of earmuffs that are almost noisier than not having any at all.
Granted that the music does sound betterwhen flying, however I think now that I've upgraded my DC's I think they are hardly any better than my Altronics....
That's my 2.2 cents worth (inclusive of GST)