Sound quality - sound quality is great a little bit not enough bass but otherwise very nice.
Noise cancellation - it cancels almost all the noises except human noises. If someone will speak to you, you will hear them, but if you sit on an air plane even near the engines you wont hear anything.
Comfort - these headphones are the most comfortable headphones I have ever had. The leather is so soft, even after several hours of using these headphones your ears doesn't hurt.
Price - totally worth it, the price is a bit expensive but it is worth it.