recently got the QC20, the innerfidelity review is way more spot.
Of course, sound quality is not high-end. But it's a well balanced sound signature
which feels a little veiled and loses some seperaration when the music is getting very complex.
Theri Noise canceling is impressive and filters out a lot of low freq noise and even voices sound more distant, but don't expect it to cancel out all noise below hearing threshold level.
That's just not possible today.