I have the Rancho 3". I have no real complaints, but then I have nothing else to compare it to as this is my first suspension lift. I will take it on its first true off-road experience this weekend in Gilmer, TX for the ultimate test.
In all, the only "complaint" I would have is that it sounds loose, but feels fine on rough terrain. Its done that since day one and given me no actual problems or cause for concern.
2007 JK Wrangler Unlimited (Black), 4" SuperliftRanchoExpress Lift, 36" Super Swamper Irok's covering 16" ProComp's, AFE CAI, FlowMaster 40 Series, Shrockworks Rock Sliders, Rock Hard line of undercarriage skids, Warn Powerplant, Shrockworks Mid-width front bumper, Dana 44 Front