I've been using Bose noise cancelling headphones for many years, and they have been excellent. I travel alot and use them on trains and planes, and in that environment they can't be beat. They are superbe at reducing that low freq. drone that is so draining! So if you travel and want a quiet zone, then buy them. I don't use them about the house, so I have no feedback to help in that environment.
Cheers
BT