The ATH-A1000X got here a day early! : )
Just hooked them up to my HT gear downstairs--so no great shakes for source/amp: Sony BDP-S540/Denon AVR-1905 [headphone out].
What I have heard I admittedly like so far, though, which surprised me, given my so-so experience with the A950LTD some years back.
Funny hobby. What I may not have liked ten years ago becomes something I like today.
To me, the A1000X are the "midrange-centric" headphones that the reconstituted DT880 Premium/2005 [a huge disappointment, given the prior DT880/2003] aspired to be. Mids are forward, but fleshed out, coherent and detailed. Definitely some roll-off at both HF and LF extremities, but it seems to be just enough not to bother me, at least at this novelty stage of my encounter with the A1000X.
The A1000X offer up a roomy [despite their closed design], lively and immersive listening experience for me, too.
I agree that the "winged" support system, while appreciably lighter and less bulky feeling, is not as robust as what was used previously, e.g., on the AD700, and might warrant a de-merit. But, fortunately, I have a big head. I tip the wings slightly forward and position the earcups a bit high on my ears to get a proper fit.
I will say that I MUCH prefer these to the DT990/600 [I know: they're open] I auditioned a week or so ago.
Music (so far):
Bob James in Hi-Fi (SACD)
Lee Rittenour Collection