I think the NSA scapes look really cool as well. I think there are some drawbacks though. Yes, he has excellent flow and his tank bottom is almost self-cleaning because of how it is designed. However, his fish have no place to hide or rest from the flow. He has already lost a few fish that might have benefited from the hiding places a more traditional scape might provide. Of course once his tank matures the coral in combination with the rock will create a labyrinth of hiding places. But what do you do the first year or two? Right now he is building some semi-temporary structures in his tank to work in the meantime.
It would be cool if you could design a scape similar to his but the core is a bit more solid to allow for caves.