I received a pair of these phones today. My original impression - very etched, stark, little bass, good balance, clear.
I been using a pair of the Moondrop Chu II for the past three months. This one sounds very natural to me.
Measurements seem to indicate that these iems should sound very similar, although the measurements did show about a 5 dB drop below 50Hz in these (Truthear Zero) wheras the Moondrop is close to the desired curve.
I was not prepared for the huge difference in the spectral content. I much prefer the Moondrop.
However, if you enjoy your music blindingly bright, then these Truthears iems will be very pleasing as they are very, very clear.
Of course, my opinion only.