My opinion is that Devialet is one of the new high-end audio brands that seems to be on the right path. Not sure about the Phantoms but their main line of amplifiers is quite good and gets good reviews:
[Link: en.devialet.com]

We are setting up next week a pair of B&W 805D3 that we sold to a customer that already owns the 220Pro and it will surely sound magnificent.

I had the same reaction as all of you when I saw the Phantoms but when I heard them and also later when I heard their pro amps and read the reviews I have changed my mind. This does not mean that there is mass space in the market for a $3k sonos play5 competitor but on the other hand most CIs do not bother with Wilson, Sonus Faber, Macintosh, Classe, B&W e.t.c and these brands still continue to do as well as ever.