I agree that if done right, it should make a stronger and lighter bar and stem combo, since they're doing away with one of the clamps.
They used to be limited in the sizes available, but I don't think that is an issue now. One problem is that they don't list the sweep angle. I suspect its in the 5 - 6 degree range, when really, for a 700mm wide bar, 10 degrees would be better.