(edit: forgot to hit post a few days back)
First impressions after using this for a few hours after I got them: amazing. (Yes, the unboxing was cheating a bit — I re-boxed it. :-P )
Are they worth $550? I’m not sure I would pay that much. Are they worth the $250 I paid for them? Yes. These are the best cans I’ve heard ever and I think the quality justifies the cash.