For those of you looking for an IEM around $60-$70, give the Zero Audio Carbo Tenore ZH-DX200-CT a look before they're gone (don't see them on amazon.jp any longer). I've been on a quest to find an upgrade, but I prefer them over the BA200, Fidelio S2, Gratitude, Pistons, Basso, GR07 MKII, RE-400, etc. Airy vocals, energetic, extended but not sibilant highs, quick, hard-hitting bass (more quantity than BA200, S2, RE-400, GR07 MKII, less than Gratitude and Pistons), and tuned to sound natural (not too bright and not too warm/dark).
Bassos got more hype, but I think those who had both (me, DannyBai, Lifted Andreas, Kahaluu) prefer the Tenore. People may have tried the wrong one