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I have a pair of the Quiet Comfort 2s, and they sound incredible. If you have a local Bose store, head in and test them out. If you like background noise though, you probably won't like them. They do a good job of shutting out background noise.

On a recent flight to the US, Sigmatel flew me business class, and we had Bose noise-cancelling headphones handed out to us. They didn't have model numbers on, so maybe some Boses are better than others, but these Boses were both less comfortable and less effective than the Etymotics earplug-style headphones I had with me. The difference between Etymotics and Bose, in terms of jet noise etc., was nearly as noticeable as the difference between Bose and nothing at all.

Peter