I'll agree toa point with the "crisper" look. I bought and installed the 3D Carbin GT500 rear spoiler on my2011. The factory GT500 has the removeable center lip (there are two lips for different downforce at the track). The GT500 lip is molded in, so at least had that painted black to give the illusion it was a factory item.
Saved about a hundred bucks, so it was all good for me.
There is usually no replacement for true OEM parts, but most of the aftermarket does a decent job with some quality stuff.
Therer are some junk out there though. the saying "you get what you pay for" is very true here.
Let the buyer beware.
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.