Even at first glance, it can be glaringly obvious that Head-fi in general isn't a fan of Active Noise Canceling Cans, and there are valid reasons for this; for one, the active NC module is prone to creating noise and distortion in sound on its own, and for two, there simply aren't too many good ones around. You'll have majority of the posters here often throw their hands up in the air and say "go for Bose Quietcomforts if you must go for Active NC can", which really shows the lack of good quality NC cans in general. I was also one of the doubters...