I have them in my Bryston 7B3 Monoblocks. I rebuilt them from the ground up, swapped out every resistor and capacitor for matched boutique ones. They have an absolutely stunning timbre... zero distortion. (Also make my own fuses, silicon dioxide with a mineral oil mix as a dampner).
I am a classical music snob, plus jazz of course, and instruments on this system are very realistic, and have an extended 3D stage, pronounced front to back layering.
I asked Duelund about getting some for my tweeters on my modified Maggies, but they can’t do anything at the moment because of supply chain issues.
I’ll probably save that upgrade for when I get a pair of 20.7 Magnepans. That speaker would justify the cost of the crossover.
I make all cables as well, out of Copper foils, USB, XLR, Power. Copper sounds the most natural to my ears, not a big fan of alloys and plated metals :)