I have to disagree - firstly most sketchup users have not heard of Corona, it is definitely not mass market stuff like Vray, next, everything is definable / instructable by simple video tutorials and base setup scenes.
With regards to white, ever since I have caught wind of this lowered white value (from Max side of discussions, even though I am not a Max user), I have lowered the white values for a all materials.
I am ever ready to learn about materials, mapping, and displacement, HDRI whatever that Corona can throw at us, but it is still buggy at this point and not enough features to fully implement Corona properly.