I have a fiberglass Hartline hood on my car and it is of the highest quality. I believe they sell fiberglass bumpers as well so I would expect them to be of the same quality. Kirban also sells fiberglass bumpers which I've heard are pretty good as well.
Danco is not very good. The cut edges are pretty poor and aren't even close to straight. The fog light holes really suck on the danco's. I have a glasstech on the front of mine and it's better than the danco, but not perfect.