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

Look at Piega.

Cheers,

The best I have heard was the Manger driver - mangeraudio.com.  Heard them years ago in a custom design.  I have heard some others, and, IMHO, these walked all over the KEFs I've heard.  I have heard the Piegas, and they are pretty good, too.  But who has heard ALL of them? 

@timlub - I have a pair of the Insignia coax speakers on a shelf in my dining room.  Powered by an old JVC receiver, they sound amazing with music from my server via Plex on my computer, and that is just using the audio out from the sound card.  They would never be mistaken for high end, but for the price, they are killer.

@bondmanp 
I changed the crossover a bit (changed slope, all polyprop caps, better coil), added zcomp, added felt to the tweeter ring and stiffened the cabinet.... 
You would fall over with the difference!