I haven't had any issues with the basic Rough Country lift that I've been running for over 5 years, however recently I swapped in 6.5" coils and dropped the shackle down a notch. My over all lift gain was less than 2 inches up front and a fraction of an inch in the rear.

So I'm a little disappointed with the RC leaf springs. Now I may just be expecting more out of a leaf spring than I should be, dunno. The 4.5" coils seem to have done well, and I wonder if the new 5 year newer 6.5" coils are softer. I know the ride is slightly smoother. I've never expected a smooth ride from a lifted 4x4, so this wasn't important to me.