Summary: Very comfortable headphones. I bought some comply tx-400 mediums to go with these and they work great. Not the best isolation as some have noted but does it better with the comply's. Sound is warm and very enjoyable.
Summary: I had never used noise cancelling headphones before, did a bit of research and took a gamble with these. I travel by train and tube and use them with my iPhone. Sound quality is pretty good and once you choose the right size latex 'bud' thingy the noise cancelling feature works very well.
Summary: My first pair of noise cancelling earphones. Works quite well with my iphone, cuts off most of the background noise while I'm listening to my favorite music. Switches seamlessly between music and phone calls.
Summary: Great product, the earphones work really well for music, video etc. they match the quality of much more expensive devices. But they really come into their own when you need to do long phone calls from a busy location - airport, station, Starbucks etc.
Summary: I've had many noise cancelling headphones (though not Bose, I don't like the bulk of them). The DS-321D's are the best I've tried. These are more effective at cancelling noise, and provide very impressive music reproduction with or without the noise cancellation turned.
Summary: At first I could not hear the slightest difference between having these DS EARPHONES switched ON or OFF! They seemed a complete waste of money. A few days later I tried again. They come with three sizes of ear buds.