I've had a Rough Country 4" lift on my rig for almost 2 years now, it developed some noticeable sagging in the rear after the first year and I bought a BDS Add-a-leaf to help raise it back up. I never really persued (sp) getting warranty replacements but I knew it was possible. Last night I sent some pictures I took before/after the AAL install to a Rough Country employee on Jeepforum, he even saved me the hassle of getting my order number from where I ordered the lift. So Monday they're sending me a new set of rear springs
I'm going to remove the AAL and install it in the new packs to keep it a 5 pack leaf w/ my hard top. I guess I can use the old set as a boat anchor or something
But other than the sagging, they're really some pretty darn good springs. They flex like crazy! Great customer service, Rough Country