I have the ORE weld on skids. They work great. Haven't tried any of the bolt ons, so can't really comment on them.

 

I started thinking about the ball joints being an issue for the heat when welding the C gussets on. But if its ok to take time and the wet rags then ok. I do weld, have not welded on an axle yet, but my son and I are working on his XJ and he wants to add the skids on a dana 30 HP that we are swaping in. Plus we will be swapping a dana 44 into the rear and it needs the shock mounts relocated to compensate for the pinon angle with the 5.5 in lift.
We aquired a rolled xj with alot of nice drivetrain to use.

 

...AND

The droop is increased, so you need to check if you max out your brake lines and if your springs might pop out of their perches at full droop. Again - something to be aware of.