The Sundara arrived today. I appreciate the loan, thanks to the Hifiman team. In the next couple of weeks I'm going to be comparing them to: Modhouse Argons, Grado 325e, Fidelio L2, and maybe the AKG Sextett, for fun. Sources: an LGV20 or ZTE Axon. Spotify Premium Amps: AKG HP4E, Schiit Magni3, and Fiio A3. Some very quick impressions: Build quality is very good. The materials used and the fit/finish are what I would expect at this price point, I have no complaints. I really like the metal they used for the cups, it feels solid and premium without being overly heavy. Comfort: the jury is out...they are relatively comfortable, but a little more clampy than I like. I am sure I will get used to it or find a more comfortable position. Treble: not too bright to my ears (I am 50) nice details/clarity. Natural sounding Mids: very realistic/natural sounding. I like them so far, I'll need to listen to them more to get a good read on them, but so far I'm happy there. Bass: accurate, detailed sounding, if a little on the light side. Soundstage: not cramped or small, but also not quite what I would hope for from an open headphone of this size. If I was listening to these blind I would have guessed they are a semi open design with a relatively large soundstage, if that makes sense. I am impressed so far, I look forward to spending more time with them.