Following the instructions are key to ARB setups. ARB's get a bad rap sometimes from folks who didn't follow the instructions exactly. At my house we have done 7 in our garage and they have all worked like they should.
x5
Read the directions front to back before you even start. Do it when you can concentrate, not while watching TV. Then go after it, follow the directions step by step, don't leave anything out and you should be fine.
One thing that doesn't get mentioned in the instructions, is carrier preload and how much to use. I put as much as I can without damaging the shims. I'll even take a spreader, spread the case and still put quite a bit of preload.
The more preload you give it, the better. If you spread the case, don't spread it too much and ruin the housing. But if you do put that much preload in there, it pre-torques the housing. This will keep the pinion from deflecting off of the ring gear and the case from being able to flex and brake in half.