I also posted this on the tech forum, wasn't sure is the appropriate forum...
Just bought a 2006 4.0 auto, with a 2" lift kit, done with the hockey puck style insert at the top of the springs. I know next to nothing about these or other lift kits, and have never owned a jeep before.
The Jeep does not vibrate nor does the steering wheel wobble, but it does feel a little squirrelly. It may be fine and just how they ride and drive, but it feels like the steering will over correct with a slight pull on the wheel, like the last thing you would want to do is pull quickly on the steering to avoid something. I think I'm feeling it as something similar to bump steer.