After 40+ years I am totally satisfied the the incredible sealed-ribbon tweeter that Raidho uses (and Borresen Acoustics) in its D series (old used D2s for me). (Mid/woofers ported, but a small floor-stander 'box' design.)
I liked my oldest, 16-yr mains, ML SL3 electrostatics, but the treble performance of the Dynaudio silk Esotar II was much better for the five years I owned the Sapphires, nice speakers but not the D2s I was fortunate to acquire. I do feel silk is very good for a dome, metal not so much, and diamond tweeters-ugh, never took to the B&W 800s a bit, too harsh for my ears.
The Heil AMT type sure offers some good examples and probably some so-so, like all styles as others have noted. Implementation of the design counts.