Fiil CC2 has a very beautiful minimalistic design. They remind me a little of Edifier H190. I like the app but I think there is only a Chinese version
Not taking into account the quality of the mic, which is far away from decent, I think that TWS earbuds have really improved, in terms of sound quality,
over the last two years, especially budget models. In many models. We can see more and more advanced drivers such as Ti, Graphene, DLC,
also many of these have their own apps with great features for additional tuning which is very important IMO.
have you tried the CC2? i wonder how's the connection strength? this Onyx Ace has weaker signal than typical IEM TWS as it sometimes stutter on one side.. might be because of my devices haven't supported TWS+ yet, but then again, i never have any dropouts problem with my other IEM TWS.
The Soundpeats Trueair2 that I've tried had even worse signal dropouts, as simply touching the stem to adjust it would immediately cut out the signal on one /both side. it's a shame because i like the size and fit of it, and the sound is also not bad at all.