Mega D'Appolito Speakers - The Holy Grail?

The engineer, scientist and author Dr. Joseph D'Appolito has a speaker arrangement named after him, a vertical array of mid-Woofer, Tweeter and mid-woofer. There is more to it than this, as the good Dr. has written quite a bit about crossover design needed to achieve good results.

I'm not necessarily talking about a true D'Appolito speaker though. I'm rather thinking of large speakers which have a central tweeter in between increasingly larger drivers. MBL, Dunlavy, Von Schweikert, Legacy, Gryphon all have built some version of this idea.

What do you listeners think? Is the dynamic range, detail, transparency, distortion and imaging consistently better than other type of designs?

Best,

E