Good video. I actually have a Amazon OEM style spoiler in matte CF installed on my Stealth M3. Very happy with the spoiler as it look factory like and distinguishes the car from non-performance M3's. Plus factory spoilers are hard/pricey to find in Canada.
One thing I notice with the non-OEM version that I don't know if factory ones have a problem with, it collects dirt and finger prints easily. I accidentally go a bit of wax on it and it took some effort to get the white glaze off.