I’ll start by saying I would never buy used headphones. So shoot me. There’s a thread about that somewhere on A-gon.
At any rate, I own and very much like my HIFIMAN Sundaras. But if I were in the market right now, I’d jump on the HIFIMAN Edition XS. A friend sent links to a couple of reviews recently. One review is older, but relevant. Why? New HIFIMAN Edition XS for $209 on Amazon - less that what I paid for my Sundaras. Edition XS were formerly $500.
Do a search on these reviews: 1) Joshua Valour & the HIFIMAN Edition XS, and 2) The Audiophillac (Steve Guttenberg) reviews the Edition XS.
@lionel_hersch , add a Schiit Vali 3 headphone amp (I had one previously) and you’ve got a complete headphone system for under $400. What’s not to like about that?! Hope this helps.
Happy Listening!