I am assuming you're talking about the c-one REPLICA scoops. The real c-one costs about $250, not mention months of wait. Replica scoops needs to be test-fitted first before paint. Other than that, installation is very simple. The paint usually run about $60 -$80.
I don't really have any experience with VIS Fiberglass ones. I have the VIS carbon fiber on my car. The fitment is good and no paint needed.