Sibilance free, vocals are quite even which is good. Wish the bass were a little less overbearing and the treble more even/filled out with better attack- snares for example sound slightly tubby and muted as is. Sounds a little congested as a result, especially at lower volume levels. Very good nonetheless, especially for its price. Tested with my Motu M2 Motu M2 Review (Audio Interface) | Audio Science Review (ASR) Forum
(EDIT: Ah, forgot to comment on the form factor! Its housing size is small, ergonomics and fit is good and the iems are light which results in comfort. However, the cable sleeve is kind of springy which can be annoying, especially being undetachable/unswitchable and when the iems themselves are light and the nozzles insertion is on the shallower side- sometimes the cables don't hang off the ears properly or result in the iems coming loose over time/with movement)
(PS: I really like the look of these iems though, they can fit a wide audience imo)
(PPS: Original spiral dot tips from JVC do help with the treble and soundstage. Perfectly happy with it for the asking price as such, increased rating to 5 stars)
Final words: After 2 years of use, there is major channel imbalance due to clogging of the right nozzle filter (non visible). The nozzle diameter matches specs of Moondrop single DD iems, might be possible to adopt the filters of those models. However, the cable also suffers from slight discolouration, hence I chose to upgrade to the Moondrop Aria instead of going through such troubles (and risk). Overall I'm very satisfied with what I got out of these and their lifespan