^^^Amen brother! You have to be one of the lucky few to get SGM! I just think it was probably a cost-cutting thing for BMW. The base paint is the same for Space Gray, but the difference is in the metallic flaking. I think SG has only silver flecks while the SGM had silver, blue, and purple metallic flakes.
Space Gray:
Sparkling Graphite Metallic (my car!)
