Some impressions (without mod) of Estrella:
Pros:
Good tuning throughout FR
Good sub-bass over mid-bass
Mid-bass is not cut
Separation of bass from mids
Lower mids are neither thin nor too thick. They have very good quality.
Upper mids have a unique tuning and interact well with the rest of the FR
Very good dynamic images
Treble extension is made with taste. The cymbals sound realistic
Textured drums section
Good male and very good female vocals
Textured and well layered sound, well above the price point
A sense of space and 3D stage that rivals some EST IEMs
Very well resolution 
Easy to drive
Very comfortable and with a beautiful shell
Thin and flexible cable and good sound matching. Does not need immediate replacement.
Good quality of macro and micro dynamics
Thoughtful selection of drivers. DD is fast and capable. This is an IEM that shows that the quantity of drivers is not always related to better sound quality
Cons:
The bass could be a bit faster and more textured
Uppermids may be more in quantity for some
A bit more soundstage wide
It is not completely universal. Some genres need a slight FR adjustment
The cable has no switches
There are eartips with a better match
Soundstage A+
Timbre A
Fun factor A++
Tuning A+
Tech A+
Overall A++
vs Thieaudio hype2
Soundstage A-
Timbre A—
Tuning A—
Fun factor A
Tech A-
Overall A-
vs KL
Soundstage A
Timbre A-
Turning A/A-
Fun factor A
Tech A
Overall A
vs Glacier
Soundstage S
Timbre S
Tuning S-/S
Fun factor S/S-
Tech S/S-
Overall S
Estrella like the music and music like Estrella! Enjoy 
.