I've heard the Funktion one a few times, and they're good speakers. Nothing intrinsically wrong with them (as opposed to any other brand of speaker, really). Honestly, it's good to see a system that's not a line array (but lets not start that argument).
I'll give you a great, real world reason as to why they're not more popular:
There's about three bands in the world that spec it on their rider. Combine that with a high price, makes them a horrible ROI.
There's one system over here in Australia, and according to them (admittedly, this is heresay), it's the worst speaker investment they've ever made, not because it doesn't sound good, but because they haven't been able to make it earn it's money. It wouldn't surprise me if that's true.
Unfortunately, especially in the mid-high level companies, they have to look beyond how a system sounds, and to how it can make them money.