The shop that's currently installing my c500 kit says this kit is top notch. They've done some Cervini's stuff before and say they have the best quality kits they've worked with. Very very little prep work was required and it's as good as oem quality.
No, thats not the Cervinis spoiler. I lost the one i got from them, so i got a new one from the shop i brought my car to. And yes, i did remove the old spoiler and the new one actually attaches through the stock holes.