Well than if that's the case, take the info presented to you by both sides of the arguement and base your decision on that. If having a 4" lift kit is what you want and the RC kit fits your needs, get it. I was just trying to give you what I consider the be a better and more quality option at roughly the same price. But props for you for doing your homework before throwing money at something. I can't say I did the same when I first got my jeep.
2004 Rubicon - 4.0 - 5 speed manual - Rough Country 4" Stage II lift, RC front adjustable track bar, 2.2 shocks, 33x12.5x15 Goodyear MTR with Kevlar on Crager soft 8's, 4 Hella Black Magics, Edge Trail Jammer with Intake, JL TR 2-ways in the pods, Kenwood Excelon deck in the dash, Rough Country Stinger & Winch Plate, Trail Gear rear bumper w/ tire carrier, HiLift, Rock Krawler X Factor Plus Steering