I'm not too familiar with Sonos, but was under the impression that they are just high-end wifi speakers with some proprietary system. And that Ikea's version is again the same idea, but at a lower cost (and less proprietary?)

So what is the actual benefit here? Is it upgrading the speakers of the Ikea model? Or is it adding an amp and wifi to unpowered speakers? Or more specifically, creating a ceiling wifi speaker for cheap?

Because step way down from the Ikea speakers, and you could grab a few Echo Dots for (alarmingly) close to free, and line-out into any powered (or amped) speaker, which would seem to be about the same result? And at least with Spotify, multi-room works quite well. This of course ignores privacy concerns, which keeps costs down.