Absolutely love these headphones. They are well built and the sound is really good. Great mid-range, decent highs, and the lows are some of the best I've heard. The sound overall is well balanced.The noise cancellation is very effective for white noise. I have used them for cutting grass before, and it cansels out most of the noise from the blade, as well as that of the engine. The noise is still there, but it is muted substantially. I also keep a fan in my bedroom, and the noise cancellation negates the sound of it completely.It will not however cancel out louder noises like a baby screaming, or a braking dog for instance. It will muffle it some, but not cancel it out completely.The headphones hold a charge for a long time, and only takes about 15 minutes are so to recharge via a USB charger.I highly recommend these, and the price is more than fair.