I’m blown away. I’ve had around 50 headphones. Including Susvara, he1000, LCD-R, HD800 and tried quite a few others, and have been in the hope around 5 years.
Just got UM Mest MK2 today, and I actually shed a tear for the first time while wearing headphones. Astonished it was from an IEM. Such a unique set. Sounds good on Fiio M17 and on Holo May + 430HA bass improves drastically and overall sound quality is very impressive. I haven’t tried it on midrange dac/amps yet, but Judging based on what I’ve heard so far, they need a good+powerful source. Also noticed they are very picky about tracks. They like orchestral and very good recording quality. It punishes you if the recording quality is not good.