Oh, no doubt that ribbons have improved greatly in the last 30 years. Maggies that I had and the ones (incl. Apogee) I had the opportunity to listen to in the last century were all of the original early 80's Magnepan design. Smaller improvements here and there didn't make that much of a difference at that time.
Thing is, once I got into ESLs, that was it for me. I found my nirvana. And since the essence of ESL design hasn't changed in the last ... 50-60 yrs? - they remain my "safehouse".
I know that even a 30 year old set is not going to be far off or much different from the very latest. I draw the line at hybrids though. For me it's full range, or bust.
Thank you for the invite, very kind of you. We must make a plan.
Mike