Sorry I'm a bit late replying!
I really need to invest in some measuring gear, would like to graph these.
As
@mt877 notes, these aren't the usual smabat / lun sheng etc. type earbud so are a different beast with DD handling the low end for the piezo.
My impressions are also pretty similar but here they are:
For reference I'm using these 4.4 balanced and amped.
Mine came with a Lun Sheng branded case with red & blue tips.
Construction: Simple and solid metal housing, a little elegant and suitably named, I dig the design!
Soundstage: Fairly wide
Separation: Rather good
Detail retrieval: Good, especially for mids-highs
Bass: As I mentioned in my first comment on these, bass is very present and punchy, perhaps not as tight as it could be and a bit lacking in sub-bass, but overall hits the spot.
Mids: Forward and clear, the strongest suit of these imo
Treble: Can get a little spicy on the very high end
In short a satisfying pair that you aren't ever ever going to regret for $17-18!