0ur opinion: :The HA-NC250's noise cancellation circuitry includes feedback technology that constantly monitors the noise cancellation process. As a result, the headphones eliminate up to 85 percent of extraneous background noise. To further block noise, the HA-NC250 offers two JVC innovations that help isolate the listener from outside sounds. First, each earpiece employs a double housing structure for an extra sound insulation layer. Second, JVC developed a technique for attaching the headphone's smooth memory foam cushioned ear pads to the housing that helps isolate background noise. The smooth pads also enhance comfort. These sound isolation features, for which patents have been applied, are especially important since the HA-NC250 can be used with the active noise cancellation switched off.For the best possible sound quality, the headphone uses a 40mm neodymium driver in each earpiece. For comfort and portability, the JVC HA-NC250 is one of the lightest headphones in its class, weighing just 5.3 ounces. lt folds flat, and when folded is slimmer than most competing models. lncluded with the HA-NC250 are a slim carrying case, a four-foot detachable cord, airline dual plug adapter, and 0.25 inch plug adapter for use with many home audio and video components. The headphones use a single 1.5-volt AAA battery for powering the noise cancellation circuitry.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Cannot be beat for the price ...
I've always wanted noise canceling headphones but have always been scared away by the price...they always seem to be $300+! These JVCs were rated very highly on CNET, outranked only by $350 Bose and $380 Sony headphones. I bought them to make air travel tolerable, to be able to tune out the dull roar of the plane and the din of the airport.
These headphones are extremely effective, light and small, and have great sound. They really allow me to "tune out" completely and enjoy either silence or music/movies on the plane. Mmmm! They're very nicely packaged in a slim, light case. iPod compatible. For the price, around $109 dollars, you cannot beat these headphones. For the same price as the Bose, you can buy a pair for yourself and a pair for your two best friends!!
Buyer's feedback: 
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Noticeable reduction in airplane noise + good battery life
I purchased this for trip overseas. These headphones work as advertised. The noise reduction is very noticeable and allowed me to watch in-flight movies in comfort. The batteries lasted through the return trip also- I still haven't had to replace them: 24+ hours of total usage. There is some discomfort after wearing these things through 2+ movies (~ 6 hours)- but this is true of all headphones I've tried over the years.
Buyer's feedback: 
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* Best value in noise cancelling headphones ...
When searching for a new set of headphones I turned to noise cancelling technology. A colleague of mine had bought a pair of the Bose headphones and I was blown away by the noise cancelling performance, and comfort of the headphones on the ear. When I did some reasearch online, I found that the headphones were receiving fantastic reviews, but with two major draw-backs: price (thebose headphones are extremely expensive) and the fact that you could not use the headphones unless you turn on the noise cancelling technology.
These JVC headphones are fantastic. The performance is equal to that of much higher-priced headphones, with the added value of being able to use the headphones even with the noise cancellation feature turned off. And all of that for a fraction of the price. I used these headphones on international flights to and from Europe and they were amazing and made the flight that much more pleasant. I bought a second pair for my wife for the trip, as well, and she absolutely LOVES them.
Buyer's feedback: 
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Great Product
I purchased these on a recommendation from a friend. I was looking at purchasing Bose QC3 but saw the JVC and compared the price. The JVC are definitely worth the value. I have used them for mowing the lawn and was able to here my MP3 player perfectly.
Buyer's feedback: 
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* Great value, better price ...
Setup:
I was reluctant to spend too much money on noise cancelling headphones because my family was air travelling, and I wanted to purchase two (2) headsets so I was looking for headphones well rated and reasonably priced and a brand name I've had previous experience. Bose (Cadillac of noise cancelling headphones/sets) was way too much to spend and I felt that I could get a better value perhaps compromising quality only a bit.
Expectation:
That being said, I have never bought noise cancelling headphones so have no idea what to expect, (what's good and bad). I relied heavily on reviews from others here and would say most reviews seem pretty accurate.
The JVC is "open air" and Bose is "closed air" headphones. Excluding the electronics, I would imagine that this design difference may be the biggest factor of sound quality in using the noise cancelling and I guess for sound afficiandos, may be the biggest differential in a head to head comparison.
My experience:
I didn't use the headphones on the plane for but a brief moment, and I can only say that when the noise cancelling was turned on (with no music), I heard bearly any perceptable noise from the aircraft or extraneous noise. Any abrupt noise one could hear but deadened. The only way I can describe it was this strangely vapid dead drawing/attracting/sucking feeling in my ears. Being a child of the 70's and listening to my music very loudly, I've lost a bit of hearing so take this evaluation less seriously. However both my children and wife were extremely happy. Mom could sleep and watch in-flight video and kids too as well as vidgames. So much so that I thought two (2) were enough, but by the return flight, the three (3) were fighting over the two(2) headphones.
As far as sound quality, I listened to music on my ipod w/o noise cancellation and the sound quality was equivalent to my other medium priced head phones of around the same price point, (who can tell after so many years listening to Led Zeppelin, Rolling Stones, etc.)
As a product endorsement, I would say for the price of normally good non-noise cancelling headphones, this is an excellent value, even compared to other brands I guess....(see other reviews) I can basically buy three (3) JVC for the price of one (1) Bose. Volume control not on headset was not a factor for me, but then again, I have worn them but a couple of times. The case was great, no messiness putting the headphones away and easily fits into almost any bag. Another plus: the attachments to the plugs for ipod, plane, etc.
I hope this review helps you in your decision making process. Thanks for looking.