I've never been a believer in headphone burn-in, but these things totally opened up even after 10 hours. There's no way this is just brain burn lol. They felt way more closed in and smaller soundstage out of the box, and the lower treble was a bit honky while the upper treble was a bit much for me. All of that has since smoothed out and soundstage has widened a bit.
Again I'm not a burn in believer but there is definitely a difference on these ananda stealth vs out of the box.
I'm curious what my experience will be with burn in. I just got my Ananda Stealth V3 yesterday. My first impressions compared to the HD6XX: the sub-bass extension certainly stands out. I'm hearing a lot more detail in the bass, and straight up hearing some sub-bass that I don't think comes across at all on the HD6XX. Pretty expected based on the frequency response graphs. The soundstage is also wider, though it can feel a little "diffuse" to me at times. If you'd asked me what I cared most about in a headphone four or five years ago, I think I would have said "soundstage" and now I wonder if that's really true. I've come to like a lot of more intimate headphones as long as they're well tuned and have good imaging.
I'm curious whether the soundstage will start to feel less "diffuse" to me after some burn in.
And I came to the same conclusion you did with regards to value. Just looking at every review out there and what they have to say about the Ananda Stealth themself, and how they compare to other headphones in the $1K+ range . . . I really couldn't help myself when they're $400 (though that seems to be the new price based on the length of the sale). Even though I just picked up the HD6XX in the last couple months! Followed shortly by the JBS Labs Atom stack.
Which, as an aside: these seem harder to drive than the HD6XX. I don't think I've ever gone past the halfway mark on the Atom Amp volume knob with the HD6XX - aside from a few very quiet audio files. But anything "normal" is quite loud at the halfway point (in low gain).
The Ananda Stealth V3 though? I'm regularly inching close to the halfway mark when I want to hear all the details in a track. The new impedance and sensitivity levels certainly seem to be accurate.
I still wish someone with the earlier Stealth versions would do a detailed comparison with the V3 and see if anything has changed soundwise, because the listed sensitivity level is so much lower now, and I know the earlier Anandas had a reputation of being easy to drive from portable sources. I don't think that's going to be the case anymore (though I haven't yet tried them with my phone).
Just picked up the Moondrop Dawn Pro on Linsoul's Singles sale, though, so I might give the Ananda a try with those when I get it. Not expecting much, though (I have heard, however, that they drive the HD6XX well, and that the high impedance of the HD6XX paired with the power output of the Dawn Pro is a good match).