I purchased the Sony MDR-NC40 headphones almost on impulse because the price was really unbeatable, plus I knew I had a trip coming up to test these out on. These ultra-light noise-cancelling headphones retail for $100, and claim to reduce up to 90% of noise.

I'm extremely happy with this headphone. Great clear sound and very handy, light weight and great quality, It's a great purchase!

Great Sound; Comfortable; Noise Cancelling; Sound Isolation

Requires a battery for a good output

these are one of many on ear noise canceling headphones ive listened to and they are one of the best ive heard. great amazing clear sound and very handy and accessible, light weight and great quality. great purchase!

High quality sound and make

one battery required

I purchased these MDR-NC40 Sony Noise-Cancelling Headphones from Radio Shack for only $30 this week.  That's a bargain for headphones that Sony still sells for $100, but as about as high as someone like me, who is not an audiophile would be willing to spend on headphones.  I have owned Sony's

----Update 06/24/09----------Still going strong. These suckers have survived MANY cross-countr

Sound; NC; convenience; price; accessories; and light weight

Don't fold completely flat; rely heavily on NC function; a little overboosted

I like to watch Netflix while on the treadmill but was having trouble hearing. These headphones are just what I was looking for!

These headphones do the job and exceed my expectations. Insane bass that you can hear that subwoofers can't produce. My friend would be talking and pointing gestures at me and I would not know what the language is. Probably the best headphones and doesn't even weigh a pound it feels like.

No, I would not recommend this to a friend

Comfortable; Lightweight

Poor Sound

I prefer on-ear headphones. These headphones feel just a little tight on my head which is probably good for keeping them on while riding the commuter train. There is almost no sound 'bleed', when I have them of my ears, around my neck I can not hear the music.

These headphones are great and as far as I can tell are equal to the "high price brand". Great sound and comfortable to wear. The "high price brand" also cost about 5 times more than these.

Comfortable; Compact; Good Bass; Lightweight; Rich Sound