Ive been using noise cancelling headphones for a few years (Plantronics Backbeat Pro), and upgraded to these ones. The jump in active noise cancelling performance between these is absolutely stunning. Peoples voices turn into a quiet barely audible tinny sound (far, far superior to the BB's), and background hum is utterly gone. The first words out of my mouth when hearing the noise cancelling performance while people were speaking…well, they cannot be repeated here. Lets just say, im very impressed. Music performance is good, not too bass heavy. The reviews are right, these are the best out there.