I have the ADD Stealth Fighter bumpers front and rear. I bought the truck used in 2016 with them already installed. I had them LineX'd in 2018 because of the rust. I called ADD about them before I had it done but since I didnt have info on when they were purchased the ADD folks were not that helpful. They did say that they changed the way they paint them since mine were purchased and that it holds up better.
The LineX looks good and is holding up pretty well.