The Devialet Ensemble (which is one of their pizza box amps paired with a pair of Atohm’s GT1 bookshelf speakers) is still the best sound I've ever heard from bookshelf speakers. They have a technology called SAM (speaker active matching) that makes for some truly impressive sound. So these people obviously know what they are doing.
I've just never liked the looks of the phantom speaker but it does move a lot of air. l feel like it's hard to sell a lot of $6k + amps so they brought out the phantom which is more unique in the market.