Out of all of the suspension lifts out there for the JK. Rock Krawler is the most well though out, the beefiest (Of course all of their stuff is the beefiest), and the easiest to install. Everything fits right without a lot of wrangling and getting frustrated.
President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
I wheeled with the guys from Rock krawler in moab and there Jeep worked the best that I saw out there. Joe from absolute off road have done allot of lifts on the JK's and he is a good guy to ask if you have a question.