Amphion Helium vs Argon Sound

If anyone has heard or own Amphion Helium/Argon speakers, what are your opinions of these speakers and how do they sound different as one has a doped paper midrange while the other has an aluminum coating? 

I would expect better resolution with the Argons sounding more like a studio monitor but perhaps the Helium have some coloration making it seem more "musical" at the expense of resolution?  

Any comparisons to other speakers welcome and how they perform with both music and movies.