These earbuds sound great once you find the silicone surround that fits your ear (the smallest one for me). They are not active noise cancelling, but with the seal that is created when they fit snug in your ear it deadens the surrounding noise quite a bit. They have a good frequency range and response. The cord doesn't tangle easily. After about 18 months of use the only two complaints I have are that the dangling wires bumping into things sounds like a heartbeat on a stethoscope and my earwax gets all over the speaker sometimes (guess I should clean my ears out more often).