As mentioned in another blog, I spent time with Steve Nance from Moab 4x4 Outpost photographing Brownie, his very impressive Jeep.
Brownie has been equipped with BDS 5" leaf springs for over a decade. Steve said he did something he shouldn't have with the Jeep and broke one of the leafs. When he called BDS for a replacement and asked how much it was going to cost for one leaf pack, they said, "No charge." Steve told them the broken leaf had been his fault and the springs were 11 years old, but BDS said they had a lifetime warranty, so the spring replacement was free.
I was impressed with the BDS spring's ride, as well as their quality. Even more impressive is a company that stands behind their lifetime warranty the way BDS does.
I'm using BDS on my YJ project, too.