ive had them on here and there off and on for a few months
as mentioned above, youll need to notch the shock plate so the the bars sit straight and can work correctly. also youll need to shim the rear of the bar at the rear ubolt so that it will bring up the snubber to the leaf spring. If not, youll have more than hald an inch of gap, and you wont be helping yourself any. they are made to hit the leaf quickly and reduce the axle wrap sooner. if you allow the extra space, well then its got more time to hop around.
they are a good tool in aiding traction, they have been used for a 30+ years in the muscle car world, so they have to work some what.