I just picked up a 2005 Jeep Wrangler TJ Unlimited Rubicon with the 3.5 inch Rubicon Express springs. They suck compared to my 2009's Metalcloak coil springs.
The RE springs creak like no tomorrow and have a horrible ride.
I will not recommend RE products to anyone. Just Google "problems with Rubicon Express". Better companies exist like Teraflex, Synergy, Genright, Rock Krawler, Clayton, and Currie. Do not settle for low quality.