Stock wheels are forged, right? So to get lighter and just as strong wheels, would be big bucks. It's worth it for some, especially if you're going for looks. But for saving weight, plus the fact that it is unsprung weight and affects rotational mass, a few pounds would make a difference. I just don't know what is out there yet in E9x M3 fitment, looks, strength and weight.
I've been assimilated. 6MT/ZPP/18"/PS extended.