Please, accept my apology and forget what I wrote in this post. After spending more time with the Hola, this comment does not represent my impressions of them any more.
Once I found the right tips and the right position for my ear, they sit differently than the Zero, I am now very impressed by the Hola.
They are different, yes, but both very good at playing music, each instrument tonality sound real and correct, all the details are there. They both seem to have no distortion and can both play louder than my ears can take.
I am still very green with listening to music seriously with IEMs. It all started after reading
@amirm review on the Zero, they have been a revelation to me, showing me a new perspective.
After adapting to listening to IEMs, it is now a daily part of my audio diet, I can see it taking the lion share as time goes by. The seal is very important and how they sit in the ear, not so dissimilar as placing speakers in a room, as our ear canal seems to be, like rooms, all different, is also key to a great musical experience.
I hope the Hola will be reviewed here soon, as it might help more music lover to access a great opportunity to listen to great music and sound for very little money.