I too picked up the NDH 30 and I've been very impressed. I've had a chance to compare them with my other phones and here are some very brief initial impressions - for what they're worth. The other phones are: MySphere 3.2, Audio Technica ADX5000, AKG K812, Sennheiser HD800, Beyerdyamic T1 (1st). I'll add further comments if anything changes. I've been listening to some well recorded string quartets and some smaller orchestral music.
First, and generally, the NDH 30 is very fine I think, but not as appealing to me as any of my other phones. I find I agree very closely with the assessments made in the SOS review - linear and natural and satisfying - the bass is surprisingly present and clear - it presents an impressively layered image. The area where I find the NDH 30 less engaging is in its creation of a three-dimensional performance space apparently in front of me. All of my other phones are more convincing in this regard - although all with slightly different takes on 'natural'.
Surprisingly, I find the NDH 30 has more in common with the MySphere than my other phones. I find the MySphere similarly avoids any suggestion of high-frequency accentuation or splash. The MySphere, however, is more open and airy (although it must be said the MySphere is the airiest and most open phone I've heard). As with my other phones, it also strikes me as more refined, more delicate. Listening to the MySphere caused me to wonder whether the unembellished, 'immediate' presentation of the NDH 30 can sometimes work against depth imaging.
The AKG, Sennheiser and Beyerdynamic create appreciably deeper performance spaces, with added brilliance in terms of their presentation. Whether this brilliance is more natural is something, I think, that would divide listeners. I find some of this quality is helpful in creating the illusion of a live performance - and so can help with realism - but others may take a different view. The Audio Technica is, to my mind, the most impressive of my phones in terms of high-frequency delicacy and adds a dimension that I miss with the NDH 30.
The Beyerdynamic - which I've always loved - has probably the 'lightest' character of the phones I own but nevertheless - to my ear - presents a more convincing image of acoustic instruments. Once again, I can well imagine others taking a different view.
While I no longer own Focal Utopia, Hifiman HE1000SE or Stax SR-009S phones, I have owned them. In one way or another they seemed to me less convincing in presenting a natural performance space. While obviously a personal opinion, I'm confident I could live much more happily with the NDH 30 than any of these phones.
Edited slightly above, to better explain the comparison with the MySphere.