Here's what I have at the moment, I'd like to get more detail here.
In IMG_2124, the "grey" ish section just looks like cut plexiglass, you can see some minor chipping on the "sharp" edges. In 2121 and 2122 you can see how the "lip" of the spoiler (using my finger for reference where it ends" ends right in the corner on one side, but ends about an inch short on the other side. You can see pretty clearly in 2121 and 2122 that the edge opposite my finger is polished and rounded, and doesn't just look "cut" like the other edge. The "cut" edge is what you would see if you were approaching the trunk of the car, in all it's chipped glory. Maxton Canada confirmed that this is how it's supposed to be, I find that surprising.
edit: one other minor gripe with the spoiler is that there's a maxton design sticker in the middle of the spoiler, and it's upside down. If you approached the car from behind, "maxton design" would be upside down, it'd only be readable if you were looking at the car from up on the roof.