Well... so I reported earlier on the TRN BT20, and it's sound quality (good) and fit with the TRN V80 (very poor) and BQEYEZ BQ3 (very good)... but I actually, besides brief testing, had never actually used them in a real world situation.
I used them this morning for the first time and for 40 minutes of my workout, they were great, and I was very pleased.
Then suddenly, I heard a beep and it turned off or unpaired (can't remember which now, sadly). No amount of powering off and powering back on both earpieces got both of them working, sadly. The right earpiece
sometimes would work and had mono (right-side) audio, but the left would repeatedly say "pairing" and then play some sad tones (probably pairing failure) and needless to say, I was quite annoyed since I'm in the middle of sweating on the elliptical machine, lol. I finally gave up and just finished my workout with the earpieces randomly powering on and off and saying "pairing" and making those sad tones.
So... this is the
second TRN Bluetooth device I've had that has had quality problems (the TRN BT10 came out of the box with a background squeal before making it through 2 workouts then completely turning into a static-producing, non-working pile of trash), so I've been burned twice and definitely will not be buying any more TRN Bluetooth devices. The TRN V80 itself, however, I love! They just don't know how to make reliable, working Bluetooth devices.
I've opened a dispute on AliExpress but I fully expect to get nothing for it since I didn't upload any evidence because I frankly don't find it worth my time to try to reproduce the problem as they are sitting in my gym bag probably still blinking, in my car, and the garage here at the office is far away. I just want to be able to leave a 1-star review and I can't do that until I "confirm received" (confirming they are GOOD, which they are not) or opening a dispute.