I own NC5v2 and these are really, really good. Vocals sound incredible for me and very natural, and they have best bass definition and body I heard so far (with sub bass a bit emphasized, but very quick). I'm afraid to promote them more only because my lack of experience with other IEMs in this category. EDIT: Regarding considering these as chi-fi, NCM has already quite experience manufacturing their custom IEMs and are known there because singers and musicians use them. I also think that are becoming more and more popular in Japan.