I have an ARB on my LJ. It was actually my first mod to my jeep ... two years ago. I bought it for its overwhelming protection of my front end and covertly integrated winch mount.
The negatives:
-Its heavy and weighs down the front end. With a Warn M8000 it netted me -1.5 inches of lift.
-If you do wheel and get into lots of twisty situations the parts of the ARB underneath your fenders will rub your fenders as the frame twists in relation to the body. Basically this just causes the powder coat to go away. A body lift prevents this.
- The powder coating has started to flake around the roller fairlead. So I disagree with the previous comment about its great powder coat.
-For pure rockcrawling it gets in the way some.
- On my first tug out i bent one of the recovery points. Its still sound, but just bent.
-Its crazy expensive
-It can't be used with an AntiRoc or 35s without modification ... aka cutting
The positives:
-It looks cool
-It hides your winch out of they way. Good air flow to the radiator. Theives will have a hard time removing it.
-It does give in impacts. I got airborne and landed on it, the bumper bent on its driver side.
-It can stand up to hitting trees at low speeds. It has saved my fenders a couple of times.
-Impressive mounting system, I think it was engineered very well
All in all, I would not purchase this bumper again. I have moved from light trail riding to more serious stuff and the bumper seems to get in the way more than it protects. I would recomend buying other things for your jeep before bumpers, they really aren't all that important ... the stock ones work fine.
-Sean