Breakthrough or not, they are fantastic drivers!
They do seem measure better than the majority of the similarly priced competition.
A friend of mine has them in a pair of kits from Meniscus Audio Group, called "Virage", designed by the highly respected Paul Carmody. They are paired with the equally impressive SB Acoustic, ring radiating, Satori tweeter.Â
The midrange clarity is pretty impressive, as is the complete disappearing act the speaker does. They create an impressively deep and wide soundstage, with plenty of layering.Â
The kits are about $1300. The enclosures are not very complicated to build, even if one wants to use some sort of constrained layer damping.
So, for substantially less than $2000, the resulting speaker would compete sonically with a speaker at at least 3 times the price.