I've just upgraded to the CA Atlas, and shipped out my Cupids - but thought I'd add some very brief endnotes for an iem I really enjoyed, comparing it (entirely unfairly, against Campfire's former flagship).
In terms of bass slam the Cupid competes. It loses, but it competes, and I really do think there's something enormously impressive about the lows of this iem.
The highs are good, not as refined as the Atlas, but with plenty of detail if you listen to it.
The mids are thicker than the Atlas, but having moved in, I do come back to thinking there is something a tad, well, weird, about the Cupid mids. Something about the timbre, the way they sit in the mix. I wouldn't even call them bad, just very very different.
Staging on the Cupid is excellent, not as expansive as the Atlas, but wide enough and with excellent positioning. And fit... While the Atlas isn't the horror show some reviews suggest, I do markedly prefer the Cupid. Also the Atlas is v hiss prone, the Cupid not so much. On the other hand the Atlas is a much more coherent listen (those mids again) and slightly less warm, with significantly better detail retrieval and clarity.
Overall I'm really happy with my upgrade. The Atlas does much of the same stuff as the Cupid, but a good deal better, and I got a good deal. However... The Cupids are incredibly impressive for their price, and they don't pretend to be a flagship (they're barely a rowing boat compared to some of Obravo's offerings). So I say well done OBravo. In another world, with better self control, I'd have kept you and been happy with you, and I'd have been right.