Triangle Art Metis Horn Speakers

Last weekend I attended the Pacific Northwest Audio Fest and was particularly impressed with the TriangleArt Metis horn speakers. They are fairly massive (about 6’ tall) with a 15" (ported woofer), a Beima midrange driver for the horn, and a RAAL ribbon tweeter. The are 95db efficient @8ohms, and were being driven with a single EL34/channel tube amp. I thought they sounded glorious: very natural sound, huge soundstage, lots of tonal color, very solid bass, delicate extended highs, lovely midrange. I’m wondering if any other audiophiles out there have heard (or own) these speakers, and what are your impressions? Also, if you do own them, curious what amplification you have tried or are using? Thanks!