I too listened to these at BB Magnolia in San Antonio some weeks back. I really liked how efficient they were with my iPhone 6P since there wasn't anything else to plug them in to.
I think these will be a great buy on the used market, but knowing what's out there in this price range as far as the established models go, I didn't hear anything in particular that made me think "damn, I've GOTTA have these" the way I was summarily impressed the first time I put on a pair of HP2s for example. I am a Mac enthusiast and have a ton of Mac gear, but it's always important with Mac to understand that it's a luxury brand and not a value brand. They do have some products that are values relative to the content or other equivalents in the marketplace, but I think the name undoubtedly plays a role in what you're paying here.
Also, while I believe rumors and speculation have their place, I believe it's important to temper the desire to just state something as fact when it comes to stuff like this. I was under the impression for the longest time because of some unchallenged forum postings elsewhere that the McIntosh MT10 turntable I owned briefly (SRP somewhere around 10k) was simply a "rebadged" Clearaudio piece. After more research and being lead in the right direction at AK on some matters after I also spouted this incorrect info, I realized it was not as clear cut a case as some of the forum postings out there were stating as fact. I almost came away thinking the same was the case here with Beyerdynamic until the last few posts up there.