the Zero2 were my first IEMs that I bought after reading the ASR review, I was really positively surprised, before that I only had TWS HUAWEI FreeBuds Pro 2 which I used very rarely, I didn't like the sound that much, the Zero2 are definitely better, I then combined them with KZ AZ20, which are BT ear hooks, at first I was satisfied, but the more music I listened to with them the more I noticed that they start to lose resolution with certain titles, I don't know exactly how to describe it, they then sound dull and overloaded, I then tried many other IEMs, many with 1DD and hybrid drivers - then I came across the Planar Magnetic Drivers, they just sound more relaxed to me, I can listen to any music with them without having the feeling that they are overloaded, due to the recognition in the ASR test for the Chu II I got these too and was really shocked that I was even satisfied with the sound, I can't get along with them, they are too harsh, some women's voices are really hard on the ears, they are clearer compared to the Zero2, but not particularly relaxing for listening to music, in my head they definitely sound completely different. They have more resolution, but listening to music for longer periods is no fun, and that was the case with all other IEMs too - all planar ones have done me good so far, out of curiosity I also got the 7Hz Timless AE and the cheap ARTTI T10 - both very good IEMs, and because I wanted to know what multi-BA sounds like, I also got the KZ AS24, I was biased because I suspected it could be another bad buy - but it is unique, I like it a lot, perfect separation of elements and sounds, good stage - this thing has groove