Well, I haven't run mine yet. Sooo I can't help ya there.
But -
I love the fact that the RK arms are SOLID stock. have HUGE ends on them and weigh nearly 30 lbs each! The welds look great. I had to modify the bolts and small metal spacers to fit since I plated my frame rails and everything moved around. BUT If I hadn't done that they would have been the simplest install yet.
On the other hand, the brackets hang down below the rails about 3 inchs but they look like they will slide right along with little problem.
Over all, I believe the RK kit is a great kit for the mear 500 bucks it cost.