V90S Is last IEM which I purchased from linsoul two months ago.Previously owned few IEM's from pioneer,VKZ,IMR and KZ.This V90S from first listening sounded little sharp.Was perfectly sitting in ear like no other IEM before.Very comfortable for daily use but nothing special for sound.Because there was very comfy I used them for travel to work.But what's happened now after few weeks use.The sound totally changed up. Sharpness disappeared. I'am absolutely happy with them.Their performance get Me into the soul of music.Very holographic and transparent listening.Easy to recognise quality of played music.Use them for phone call giving very natural voice called person. Doesn't matter how many drivers is inside they sound very good now after few weeks daily use. I changed eartips and use from VKZ4 which give me rocky solid fit and prevent loose from ear.I can highly recommend this IEM.This is not just buy them and use.Take it some time to get full potential.