Noise Cancelling Headphones

[chimaera]

Ok i have a Sanyo pair which cost me about £40, they do a good job especially as i fly a lot, they're indispensable.

My question is, i see a lot of people with the nice £100+ Bose ones, are they much better than standard ones, i'd imagine that they have superior sound, but do they have better noise blocking tech? or is it just standard to them all.

http://www.bose.co.uk/noise_reduction/qc2_headphones/

 

[chimaera]

Its the noice cancelling bit i'm especially interested in, buying a £300 pair of sennheiser's is pointless on a plane when you're stuck next to the engine roar for 10 hours.

They're a lot cheaper in the states so i can get them for under £200, i'm just interested in whether it makes a considerable difference to my mid range pair.