Bose QuietComfort® 3 Acoustic Noise Cancelling® Consumer Headphones

I did a review sometime ago for the Sennheiser pxc-300 noice canceling headphones. I used it for few months. With all the hype about the Bose qc3 headphones, I always used to wonder if they're better than the other leading technologies available out there. Or it's once again Bose marketing hype. So one day, while I was walking down to my gates at one of the airports with my Sennheiser pxc-300 headphones around my neck. I saw a Bose Demo Stand in the airport. So I stopped by to check out the Bose qc3 headphones. Immediately the staff recognized I had a Sennheiser noise cancelling headphones. They insisted that I compare them with the Bose qc3. First I wore my qc3. It was definitely way more comfortable than my current headset. Very soft. To begin with I liked the comfort. Then I listenend to their jet engine recording through qc3. The noise cancelling cancelled more than 90% of the Jet engine noise. I was definitely able to tell the difference. Amazingly quiet. Then I switched to my sennheiser pxc-300 and it was definitely less comfortable and can still hear the recorded jet engine noise.
After that, without second thought I purchased the $350+tax Bose qc3. They included a lexar mp3 player (can take upto 1Gb SD card) with it.
Then I got into one of the frontier Airbus jets. I realized even though it was able to cancel more than 90% of the noise at the demo, I was able to hear a bit more in the airplane. But better than my current headset.
But definitely it's a good product. But I'm sure the demo jet engine sound they have is specifically recorded to be in range of the best cancellation frequency of the headset. Again Marketing.
But nevertheless, it was definitely better than sennheiser, and more comfortable. But given the price, everyone should expect that quality.
I tested it at home, with fans blowing and noticed that again it was better than my current pxc-300.
Only issue is that, with Sennheiser I can continue using it throughout the flight, as it has a switch that allows it to turn the noise cancelling off during takeoff and landing. Technically you're not supposed to use noise cancelling during takeoff and landing because of the electronic interference regulations. So with Bose, I still have to use the airline headphone during take off and landing.
I'm not sure why Bose doesn't include a feature (fairly easy) to just bypass the circuitry with no noise cancelling if the battery is dead. That would be helpful.