Mine doesn't have a scratch or a chip yet, although I don't use it to plow through brush if I can help it.
Chrome plating is a very thin layer of metal but it is bonded to the underling metal surface and chrome plating is harder than any paint or bed liner. Therefore, chrome finish should hold up better than paint. Most people who paint their brush guards get rock chips from hitting debris that other cars kick up and they have to touch it up periodically. I have 38K on my truck, probably 30K on the brush guard and it looks perfect.
Structurally, the Square Tube Grille Guard is two cast steel sections on the outside with sheet metal across the center. It is pretty strong, but it is not going to survive a major impact. Where welded steel brush guards will bend and you may be able to bend them back and not look too bad, the cast steel will break and it will be a total loss.