I had a dirtworx second hand, and it is a well made bumper that is now on
@tworley 's rig.
In an LJ I had a few complaints, but they probably aren't relevant for anyone that doesn't rock crawl specifically in an LJ:
1. The D-Ring mounts mounted at the midpoint of the bumper. My next venture plate has them mounted in the top third and are thicker (more soft-shackle friendly).
2. The entire bumper is about 3.5" off the bumper plate due to the mounting system, so I dragged more than I would have otherwise with the LJ's overhang.
3. You can't catch what isn't there. The ends protect the tub, kinda - but the edges would catch rocks sometimes. The corners of my tub are showing that even more with the NV plate.
4. The hitch sticks out a good bit - again, an LJ specific issue, but worth being aware of. Probably about 6-6.5" total from the back of the rig.