I've been enjoying these for a little more than a week now, and wanted to share some thoughts on them for posterity.
So far I've owned the JDS Atom (twice), Schiit Magni 3 (twice), Schiit Magni 3+, and Cavalli Liquid Spark. The iFi ZEN CAN is my favourite of the lot, considered in terms of its combination of musicality and technical competence. Quick thoughts on each of the amps listed:
iFi ZEN CAN - Immersive, spacious, lifelike, and clean. Very reminiscent in fact of the Gustard H10 with Burson V6 opamps which I previously owned in terms of its wide staging capabilities and lifelike quality, whilst being much cleaner from memory. Uniquely inviting and involving whilst retaining strong technicalities.
JDS Atom - Incredibly linear and transparent. Highly technically competent, although not the most involving (though certainly not clinical or sterile to my ears), with an average soundstage.
Cavalli Liquid Spark - A very nice, conventionally musical type sound: smooth and warm, with a fuller low-end and rolled-off highs. More spacious than the Atom, but with a clear compromise in terms clarity and detail.
Schiit Magni 3+ - A good improvement on the Magni 3. Aims for a linear but bodied sound. The least memorable to my ears. Separately, I had issues with getting enough volume out of it, as I did with both the Magni 3 units I owned.
Schiit Magni 3 - Oddly dynamically compressed. As with the Magni 3+, I had trouble with low volume output. A search online yielded a number of similar reports. Both units I owned also suffered from scratchy volume pots.