The HE1000se has now had several days of ear time and thoughts against the Arya Stealth are that whilst it's not a night and day difference to the Arya, it's quite clearly more matured and music feels like "yeah this is how music should feel" with the way it soundstages/images intricate details in the performance with everything I've thrown at it.
If the HD600/650/6XX etc are reference headphones for neutral output leaving the amp to do the scaling, then the HE1000se is an iteration of that just with a lot more emphasis on detail from all the way down the low end depths of the freq range that no HD8/6x can reach, the midrange is where the HE excels vs the Arya though, for vocals it makes them tickle your ears when a song comes on that has that almost musky type of voice whether female or male. The high frequencies never feel harsh even on otherwise harsh tracks (80s pop etc), even though it is a bright headphone, it seems to be in total control of the upper end.
At its current price, as an upgrade over Arya, I now think it's justified as a whole package from use of materials down to the sound and included cables etc. I would not call it value for money at its original £3000 or whatever the exact price was back then.
Arya Stealth in its £550 price now is superb value for what you get, though we still have the Fosi i5 to come next month, but all reviews point to it being a competitor to the Ananda not the Arya, so we will see I guess, plus we don't know how scalable the i5 is.
But yeah these look and feel as special as they sound. Susvara build quality without the Susvara oddities like pad shape/thickness and cup comfort, at least on my head anyway as others hate the egg shape. I just don't like pads that touch any part of my ears, or if the inner cup fabric touches my ear because the stock pads are too thin, even though I had HD650s for 10+ years, though Senn pads are velour all the way round vs the tacky feeling Hifiman pad sides.
I do want to hear the Noire XO though as well, the marketing says something pretty bold hence this want:
No Open Headphone Compares
Hmmm.