Hi guys, first off huge thanks to https://letshuoer.net/products/s12-hifi-earphones-planar-iems and my friend ywheng89 for including me in the listening tour. Below are my thoughts.

Equipment used: Sony Wm1a on 4.4 mm BAL

Put S12 through the pace by listening to wide range of genre and concluded these are best with Electronic, Pop and Rock. Just listen to Yellow Magic Orchestra using this, Super fun.
In short, these IEM are for casual listening and not for analytical listening, no harsh. Detailed monster they are not as it could not really pick the subtle nuances but were more than made up for it by being a well tuned IEM that excels for its price point. Soundstage and imaging are adequate.

As a first generation planar IEM offering,S12 punches above it weight and was a pleasant surprise. If you are curious about how planar IEM sound like, start here and you wont be let down. Happy listening.