I've got the sideskirts and they're good overall. One thing to note is the stock side skirts have clips riveted on just above the air scoop, but these do not, and they don't come with anything to clip the top of the side skirt to the car, so you'll have to work that out for yourselves.
The edges aren't smooth like the oem skirts, so you might want to sand them down to get a round finish.
Overall they're good, but if your expecting perfection then you might be disappointed, but either way 10x better than fibreglass or carbon alternatives, and preferable over 2nd hand skirts which are expensive and often cracked and brittle.