I'm very happy to use RB tires, the wheel quality is OK, the foam is jap foam. As you know ATS produces these tires, the wheels are light and the foam is chosen by RB, it is a mixture. May be you wont like the grey color, but I think these tires are really good.
As an example; I gave a set to a friend to test, now he ordered 15 set of these tires.