Won't help with flex, traction, suspension travel, etc. Just a bit more room for tires.
Some people hate them regardless, but most people would agree that a moderate (say 2" or less) is not always a bad way to gain some cheap lift.
Anything over about an inch or two will start causing complications: shift linkages especially can get thrown off. And radiators stay with the frame, but fans go with the body, so some people have issues there.
Generally speaking, if you can, it's best to avoid body lift and budget boosts, and go with a high quality suspension lift at the size you want. That way you're letting the lift engineers help sort out the issues, plus you get the advantages of flex, etc.
A bad combination is trying to do all three: body, budget boost pucks, and suspension. It just complicated the beejeebers out of your Jeep.