Ok i'm having bad luck with Amazon. my first unit was clearly used and went back. Thankfully as soon as i took my box to ups amazon picked up the shipping scan and shipped the replacement. new unit in house and again it looks like a return. this one is clean but the box had no plastic wrap on it, nor any stickers to seal the box. when i pulled the product box out of the shipping box it actually opened (like a book). but the product looks untouched. just curious how other people's boxes arrived, if it was sealed in any way? since they're working without issue and look ok i'll just keep them, but just annoyed at my luck.
ok i'm literally 20 minutes into listening and i can tell these are very good. very very good. way too early to go into details but my first thought was this is what would happen if you modernized the HD600. it's very balanced sounding with nothing that stands out (in a good way). speed and dynamics are excellent. not planar fast but faster than the 600/650. with every song i can't help but think this is a modern HD600.
for perspective i'm not an audio engineer, i listen for pleasure and generally like colored sound signatures. but i do appreciate a good honest headphone like the HD600, and these are very much alike. they're very engaging to me, with good punch and dynamic impact. they're not thin or lean sounding, which i was afraid of. just clean, clear, and natural sounding.
these are my initial impressions with only 20ish minutes in, so huge grain of salt please. but i'm confident i'll be keeping them and enjoying them quite a bit. as each song ends i'm so eager to get to the next. now if only they can do a similar sounding closed set for work i'd be all in!