A long time ago when I had younger ears, I heard these at an audio show in London, in a "sound proof room" and I will never forget the experience. I was working for TagMclaren at the time, having just left dCS Audio and I thought I had heard a lot of high end speakers by then, but these blew my socks off and left a lasting impression. I half believe it was the presentation - dramatic, but also extremely clever choice…
My takeaway from the several years as a hobbyist building and listening to these: full-range was the one commonality that made all the difference in the world. The two-way, three-way speakers I grew up with were crap for "sound stage" (never mind the loss in efficiency with all the crossovers).
A pair of good quality full-range drivers will sound like you are wearing headphones when you are not. Throw in a sub for the bottom end that "full" range drivers cannot carry — possibly add super-tweeters for the extra brilliance of a cymbal crash.
Fortunately low frequencies are not "spatial" since our ears are not physically very far apart so the sub does not step all over the phase information coming from the full-range. Super-tweeters are so far up in the audio spectrum that there is little competition with the full-range drivers in that regard either.
There really was not much reason, to my ears, to spend any additional energy or money on speakers at that point.