Hi I don’t have the CCA C16.

But having read reviews about the C16, it seems quite well regarded in audio sites. There’s a new CCA that just came out called the CCA CA16 (not to be confused with C16), and this new CA16 has a dynamic driver bass instead of the BA (balanced armature) bass of the C16, so maybe some reviews on it may filter out soon and compare the 2!

Hi, u can consider the Toneking Ninetails. Co-blogger Loomis made a nice succinct review on it here: https://www.audioreviews.org/toneking-nine-tail-review/

It has wider soundstage than the TRI I3, though at the expense of isolation. I bought it at full price previously, it retails around $100ish USD nowadays, and I never regretted this purchase for one second. It has a rear/front tuning filter, to give a possible 9 sound signatures – from V shaped to basshead to neutralish, so it is quite versatile, and it has great timbre and above average technicalities (for a dynamic driver setup). Only thing is it looks weird, but the fit is comfortable.

For a cheaper open backed IEM option, do consider the Senfer DT6. Triple driver set, around $16 USD sometimes on Aliexpress. Wide holographic soundstage, but has poor timbre. Technicalities are good considering the cheap price, though it needs some amping to scale better (as the piezo drivers handling the treble frequencies do need some juice). I think this is a not too bad set if you are not listening to acoustic instruments in your preferred music genres.