I got the HE400 during black friday & they are performing really really well. for $300, it's a steal considering what headphones are on the market now at $300. I did have a lot of sibilance w/ em when I first started using em, but now I don't notice it. It's been 3 days since I've gotten em & I don't believe in burn in, but i dunno. These are legit headphones. of course, if you have a poor source, they only magnify the shortcomings.
i would just be afraid it's a scam, but i guess w/ the high seller rating it can't be right?