I have not. Tom Vu filled my ears about it particularly the phono stage which he says is one of the best in the world. I would love to hear it.
I own the Viva Solista currently and that performs admirably....
That is the NAT Audio from Serbia, rated 1 in Germany. Those who have owned both NAT and the others, say they are much better than the high end Lamms, VTLs, Kondos, etc, at a much lower price. You can buy them factory direct, actually, though you lose out on service. For those who like the NATs, the NATs are the Lampis of pre and power amps.
I had the NATs next to the Jadis in my system. Cleaner on separation with orchestral music, each instrument more rounded, and more dynamic. Less airy though, more transparent like it's not there. Give it a try. Power amp are SET monoblocks of 120 - 160w each, class A, valve, but too hot for my London home. Their entry level pre blows apart the ARC 5SE