After many years of trying various gear and speakers, I have come to the point where I no longer wish to or feel the need to change anything or upgrade. I can just sit down and enjoy the music.
They are actually a variant on the Oskar Heil drivers. Mark & Daniel call them the Dreams driver; they are curved to allow better dispersion. They are made of a thin membrane, which vibrate back and forth to produce sound. Very natural sounding, not harsh at all. I could never listen to a regular dome tweeters after hearing these.