I've had the Earin A-3's a couple days now.
They sound a bit better than I recall the Sabbat X12 Pro (but maybe not better than the newer X12 Ultra). Unfortunately I cannot directly compare them as I modded both pairs of those.
The main contender for me though is the Samsung Buds Live, as both are an open, non-isolating TWS. I am using a non-Samsung Android source, so Apt-X on the A-3 but AAC on the Buds Live.
After listening to both (A/B, no EQ) I find the A-3 has a slight veil to the sound or a bit less resolution in comparison. I find bass to reach a little deeper, sound a hair cleaner and have slightly better impact from the Buds Live. The mids and highs similarly are a bit better overall. The slight difference due to the veil/lack of resolution makes the A-3 sound like something is missing or sucked out somewhere in the mids (for me).
That difference in the low end is probably why
@erockg thought the Buds Live isolated better than the A-3. Similar to the effect of a properly sealing/fitting ear tip vs a borderline one. Or perhaps that is just due to his ear anatomy.
For me the A-3 actually covers or blocks more of my ear canal opening but I find the lack of isolation in general similar to the Buds Live. I took measurements of both with a digital caliper (length, height and thickness).
Earin A-3: 20.0mm x 17.1mm x 15.9mm
Buds Live: 27.4mm x 16.5mm x 14.9mm (14.7mm x 10.7mm)
The part of the Buds Live that covers the ear canal opening though is only 14.7mm tall and 10.7mm thick. Which is why they fit much better for me.
All that being said, they are not bad but not good enough for me to keep. Especially as they are not comfortable for me and my smaller ears.
I tried different positions and even earbud foams, it just doesn't quite work for me. The first way I tried has slightly less bass but is the least uncomfortable, the second is how Earin recommends wearing it but hotspots within 15-20 minutes for me and with the foams it's too large and won't drop into the concha like it should... even though it sounds the best that way.
The other problem with using foams is adding then removing them every time, as they block the charging contacts.
One other negative (for me) worth a mention is that they will not change to the 'classic' control scheme available in their app. Even after updating the A-3's firmware (and resetting).