Attn KZ owners:
So my TRN BT20 showed up today (ordered during 11.11).
Initial impressions:
The packaging is a step up from the average TRN product. The split charging cable is slick.
The BT20 themselves appear to be well built.
They are very low latency; perfectly usable with movies and videos from my iPhone.
The fit is quite comfortable (even with glasses). I have not had them long enough to know the battery life on a full charge yet. I also have not made any phone calls with them, so I don't know how well they'll fare with the microphones being behind the ear. I suspect below average microphone performance, but I won't care either way because I bought them for the purpose of listening to music totally wirelessly.
The range is excellent. I was able to walk from my basement (where my phone was) all the way to my car parked on the street outside my house with no hiccup or drop at all.
So far I've tried them with the KZ ZS4, KZ ZSN, BQEYZ K2, BQEYZ KB1, and an aluminum quad driver IEM. I do plan on trying them with some more IEMs, to see which have the best synergy.
So far the standout pairing is with the KZ ZSN. The BT20 has no trouble driving the ZSN (as loud as I want to go), and the plug fits tightly (and looks fine). They sound great with the ZSN (I am assuming my iPhone is using AAC mode).
Best ChiFi product I've bought in 2 years. The BT20 has made my other bluetooth IEM gear obsolete - Meizu EP52, multiple KZ bluetooth cable iterations, TRN BT3, TRN BT10, Bluedio TN, some crap Baseus and Awei IEMs, and the Xiaomi bluetooth adapter (however I will still use them for earbuds and full size headphones).