I've heard Earwerkz Supra on home audition for a week or two. it was a decent IEM, no glaring faults however nothing pushed my buttons to buy one personally. This is why A83 means what it does to me. Its the Fidue which prevents me wanting / needing to upgrade, little like my Rhapsodio RDB Mini did (until A83 replaced it). I've come to conclusion unless I hear something at the same price point that ticks more boxes for my preferences I'll settle at A83 / DX90.
This doesn't mean A83 beats everything I've heard or the 'best' (a word often thrown around loosely). Simply means I've found a happy medium from what I've heard that doesn't bore me easily. Of course, being into the hobby its not my only IEM setup, I have Pono player / ER4S, Aurisonics ASG-2 / Hum Pervasion, but I've sold a large portion of my gear these past months to focus my listening time with these. Its even obvious to some extent Aurisonics ASG-2 is the more expensive, higher performing hybrid between A83 (and I love it) though it doesn't necessarily mean it ticks the right boxes for my preferences A83 can.
Btw: The stock A83 cable is already pretty decent (besides the connection issues some report). Its probably only a few IEM that feels like a custom cable comes included stock, and it is silver plated. I don't feel much need to upgrade it personally.