A good reason why is it's one of the closest approximations to a point source horn, which is (IMO) the definition of ideal for music reproduction. The big deal with Danley Synergy is the way it presents the music. If you haven't heard a good point source horn speaker (most have not) expect to hear the best soundstaging/imaging you've ever experienced, a speaker like this transports you to the venue. The compromises are the midrange ports into the sides of the horn and the overall profile of the horn will cause more diffraction than is ideal and there will be some unevenness in the frequency response. The FR could be tuned to be more even with the crossover but this isn't done because cost and application do not require it (info right from Danley).
Red Spade audio has a version that might be better suited for home applications:
http://www.redspade.com.au/audio/PSE-144.php
However, for home use I believe there is a better, simpler way to accomplish a similar objective, and that's the speaker I'll be releasing soon.
It has no ports in the side of the horn, uses a LeCleach profile for less diffraction, and the midrange horn covers from 400 - 15000 Hz, which results in it sounding like a point source even with nearfield listening. Also, frequency response is more even in the critical midrange. It uses a Fostex T500AMkII super tweeter, the mid and tweeter as a unit are about 105 dB efficient and they have only a single cap for xo on the mid and tweeter, so very SET friendly... bass is active with 32/384 DSP and NC500 amps. Downside is it can't achieve the SPLs of a Danley but it can hit 120 dB at the LP as a stereo pair, which is more than enough for anyone and any style of music. I expect this speaker to be better than similar-looking speakers from Avantgarde, Odeon or Cessaro.