After listening to ST1 I didn't understand why TRN did not use the same 30095 BA for V90 heights. It is sad to find that several times cheaper earphones from the same brand play something often cleaner and better. On slower and quieter tracks, the V90 plays great, the sound is stronger and more voluminous than ST1, but I have a problem with fast songs and ST1 handles them better. If TRN made some improvement on the V90, it's good, but unfortunately late for me, I'll wait for the V100
edit: Let me add one interesting example. In the opening song The Reckoning from Resist by Within Temtation, the V90 sounds fantastic and emotional in the quieter melodic parts, but then the faster rythmic chorus comes in and everything, the instruments and the vocals merge into one thick mash. ST1 seems to have more air, can be listened louder and even in the chorus, the separation of instruments and especially percussion is clearer, not ideal, but certainly better than the V90. Just as I like the V90 and my requirements for good sound will be different from the others, the ST1 is more universal for me.