A head-fier friend that's tried on the Abyss told me he found them uncomfortable to wear, I'll never find that out because I'm not brave enough to put them on my head.
He also told me how they sounded, but I'll leave it to him to post his thoughts assuming he'd want to.
Yes I am the guy who tried the Abyss, not at home but at a high end UK dealer who really focusses on the headphone market.
I use Stax SR009s with a Cavalli amp at home, and the SR009s were there at the dealership too (not with the Cavalli or Woo or BHSE however) along with just about all leading brands.
For a potential price of £4,250 I was unimpressed. The headphones are really ugly, and although I could live with that I would prefer more elegance. I found the fit awkward and the weight noticeable. But my major reservation is that I found the sound did not astound me, which it should for that price.
Of course this is all qualified by the fact that I was not sitting in my own chair and not using music and source and amplification of my choice. But then that applied to the other phones I tried too. I just felt that it did not stand out from the £500 or £1,000 alternatives I listened to and - for me - it ain't an SR009 and certainly not an SR009 beater, in my view.
Of course, others will favour its attributes and perhaps put them ahead of anything else in the market - which is a good thing for the industry and its diversity.