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Sennheiser CXC 700 In-ear Active Noise-Cancelling Headphone Review$229.95
All in all, the Sennheiser CXC 700s perform about as well as they should for headphones a little cheaper than they are. Normally a slightly inflated pricetag wouldn't be such a horrible thing, but the user experience is downright awful because of the remote. It's big, heavy, causes durability concerns, and in some instances can cause pain while listening.
All that aside, the distortion isn't too bad for an active canceler, and the tracking response could be worse. What we're looking at here is a set of very average headphones, geared to the frequent air traveler. Because airplane engines tend to output a lot of noise that can damage your hearing on long trips, it's a very good idea to attenuate some of that droning noise, so this is a feature worth the money. Still, there are better attenuators for less.
As we previously mentioned, the remote is so ludicrously big and heavy for the thickness of wires used, so durability is a major concern. On top of the risk that at after a short while you could tear your cable in half is the potential for putting too much strain on your ear canals causing pain. If you do decide to get these, absolutely make sure that you can clip the remote on your clothes in a way that it won't fall off easily. Definitely not for exercising.