Pros: I've owned two pairs of these - I broke the first after two years of use, and bought the second for my girlfriend. Excellent fit - very comfortable, even with glasses. Doesn't require batteries to operate, unlike other brands of noise cancelling headphones. The removable cable is possibly the best part.
Cons: You have to take off one of the muffs to install the battery. Somewhat hard to clean.
Summary: Overall they have good audio quality, the highs and mids are pretty defined and offer good sound as for comfort the foam on the cups have a memory effect so they get more comfortable the more you wear them but they're pretty tight on your head not recommended for long listening.
Noise Cancellation: They do a good job of cancelling. Blocking out a good amount of noise in noisy places (restaurant etc.) the pads also give off a good amount of isolation on their own.
Pros: Clear sound quality, Noise Cancelling, Music doesn't die out if there's no battery, Price
Summary: These hurt my head almost right away. The good sound quality is not noticeable when my ears and head hurts. Having said that, the price is low and if you don't like them then just return them.
Pros: price, cancel noise well, work without a battery