If you do what kind from where and how much do they drop?
nope, no one has ever used them. they will make your jeep fold like a taco.
seriously. this has been covered eleventy-billion times. searching will give you answers to your questions
Look at a stock XJ;s front suspension. You'll not that the lower control arm is level to the ground. Lifting your jeep changes the angle of the lower arm. At lifts up to 3" there's a slight upward angle from the axle to the body. At greater lift heights the angle becomes more pronounced. The affect is that road virbrations are transmitted into the body rather than being absorbed by the suspension. The use of drop brackets returns the lower control arm once again to a level orientation at lift heights of 4-5 inches thus smoothing out the ride.
If you're running a short arm suspension and lift heights of at least 4.5", the use of drop brackets and braces restores a more factory like ride to your rig.
Thats what im worried about is the arm angles they look severe to me and i have a short arm