I've heard them twice, once at CAF and more recently at a dealer's home. They are really, really good and at some point, I will probably take the plunge. I do find it disappointing that for a newer speaker on the market they have jumped the price more than 30% since I was first aware of them at the end of 2019. I guess the appearance on CBS This Morning was good for them.
I do think this is heirloom quality stuff, so maybe they are not for the speaker flavor of the month club but for others, the value might be there. I own a pair of Volti Audio Rival SEs that are never leaving my house. I imagine the same would be true of folks who own the Deville's.