As I understand it, sweep work as a Cl dependant dihedral.
This can be of use when designing a modell, at high angles of attack, i.e. high Cl the wing have dihedral.
At low AoA there is less dihedral. This way dihedral have become speed dependant too.
Another feature is that the dihedral effect always acording to the Cl, fly inverted and the dihedral is inverted, stabilizing the plane up side down.