Energy Suspension vs RS*R Bushings

[bigjacsoc]

What is the difference and is it really worth the extra $50 or so for the RS*R set? I mean polyurethane is polyurethane right? Is it more expensive because it says "D1 Spec" in the title or are they actually better/stiffer/made of better materials? And does anyone know if the RS*R kit comes with everything/more than the Energy Suspension kit?

[Propaganda]

I have the RS*R set and I think it is the same thing.

If anything you can call both companies and see what durometer the polyurethane is although they both seem the same.