The wing is unpainted when you buy it (no primer on the ABS plastic).
I have not noticed any shaking in speeds up to 200km/h
The total cost for the wing and paint was about ~700USD.
I installed my wing from Showcase yesterday :)
Really good quality (ABS) on the wing, and the drill template + instructions made it easy to install.
I used spring washers and blue threadlock on the four M6 bolts that holds the wing to the trunk.
Going to install the vortex fins next week.