Summary: This is my first pair of noise canceling headphones so I don't have much to compare them to.
What I do know is that I wore these for two 14-hour flights on a C-17 cargo plane, and two 2-hour flights on a C-130 cargo plane. For those of you who don't normally fly on military aircraft I will tell you that if you don't have a set of ear plugs in while you're in the air, then you're not going be having a good time on those planes.
Summary: Well worth the price; works great on an airplane.
Major function for me is its ability to drown out background sound, which this does as good as any others I have ever tried.
I cannot seem to get on-ear or in-ear (buds) to work so need over-the-ear, so these are a great alternative to the higher-priced Bose or Sennheiser.
I like the removable cord as it can allow longer distances (at least until I leave it behind on the airplane :-)
Case is perfect for including an iPod.
Summary: These headphones are very nice. We used them on a recent flight and the noise cancelling worked well. The comfort is not as good as my husband's Bose headphones, but with the price we paid on Amazon we feel like we got a great value.
Summary: These headphones were a great choice! From my perspective, all positives and no negatives. I almost purchased the Bose headphones at more than three times the price I paid for the Panasonic product but I'm sure glad I didn't! I had listened to the Bose and these headphones sounded just as good to me. A professional musician might have a different opinion but frankly, I couldn't tell the difference.