This is a good condition X3-II that I don't use anymore since I'm not on the go like I used to be. Comes with original box, usb cable, and silicone case (which was never used).
$120 paypalled and shipped in the US.
I had the same impression... super comfortable, not the most detailed or anything, but good for the price.
Unfortunately mine developed a partial short within a week of desk use, so I'd say the wire is fragile along with that swivel point. Sent mine back, but if you can keep them working they're a heckuva deal.
These Freeboss headphones, which I assume are identical, are only $47 on Amazon with two cables included. But that's kind of a stupid name to be emblazoned on the top like that, so I'm glad I ordered the Marantz. :) https://www.amazon.com/Freeboss-MDH9000-Headphones-Single-side-Detachable/dp/B01M7YTGGC