I bought ybf iss014 as well fallowing the hype train, went out for a run, feeding techno to them tzusing, lena wilikens, etc and was amazed by aggressiveness and amount of details they bring (bass tightness and pace/ treble was very prominent in tracks). I did get tired though after 2hrs of straight listening and instinctively took them off on the way home(treble, but it's not piercing in any way I'm just used to different sound signature). Than decided to spin my music collection with Charles Jr by Jorge Ben and that's where things start to fall apart for this IEM. Bassy guitar notes sounds great, but higher ones are a bit unrealistic for me, as well vocal of Jorge himself seems grainy and a bit sharp, though well detailed. Next Passarinho by Gal Costa and vocal reproduction differences are even more obvious here, they miss that mellow sound of amazing Costa's singin comparing to my pm-3, as well that swing when instruments kick in after the intro of the song is gone, so I decided to test Erza - Garten meiner Fantasie, very "airy" track with vocals and drum parts echoing and perfectly layering one on another, it's there, but it doesn't have that amount of air and stretch, especially the drum part, it bumps and it's gone quickly, same story with vocals, though it is more forgiving on this track. From my point of view these sound amazing with electronic music, maybe it will perfectly fit rock/metal, aggressive genres( highs/bass/subbass), but on instrumental songs I can sense that things are out of tune, it doesn't draw me into music or make me feel like artist is really performing in front of me. However for the price you can't really complain, it puts to shame my 2.5x more expensive multidriver fiio and stands strong with tin audio t2, but I doubt that there is a way to find "magic" in such price bucket. Happy I didn't order impatiently kz zs10 I truly these would have been real disappointment for me