Who makes the best "Coaxial" Tweeter/Midrange design?

Hi OP!

You may want to take this question, and search for existing answers over at:

http://www.diyaudio.com/forums/multi-way/

You don't mention form factor. Eminence, Radian and others make 8" or larger semi-pro coaxials as well.

WLM speakers have a coaxial driver. I'm not sure whether they are still making speakers. 

Are the drivers in the KEF Moon and Blade that much different from ones used in the Q series, R series and LS50s?  They all seem to be made with precision control.  Is it just the crossover components and cabinets that are upgraded?  

Coherent speakers, out of Canada by Frank Fazzalari, are another coaxial.  They have received some great mentions but don't know much else about them.  The prices are attractive.