Among the best looking headphones out there, I read some so-so reviews on them (on Head-Fi and I think CNET) regarding sound quality.
I've heard the Bose QC-15 several times and the noise rejection is great - but sonics are not and if the battery dies, the 'phone does too.
I bought the Sennheiser PXC-450 for $349 and am very happy with the decision. It's got sonics like a good $200 can, isolation and noise rejection just slightly inferior to the Bose and the 'phone operates without any battery as a plus.
They're def not lookers - tho made well and fairly comfy sitting well over the ears - their the audiophool choice in noise cancelling phones out there at a price others are charging.