I was screwing around with the three Jeeps. They all have 2.5" lift springs and they all sit within 1/4" of the same ride height. They all seems to ride similarly - better than stock but still not great by modern standards. I was curious how the relative flex compares. The Jeeps: Red 1971 Cj-5 with BDS springs. These did need +1" shackles on the front to sit level Red 1969 CJ-5 with ProComp springs. (Which were available 2 years ago from Summit for a good price but seem to be discontinued) Blue 1968 CJ-5 with unknown 2.5" lift springs. Based on military wrap, the type of sliders between the leaves, and the clamps; definitely not BDS, ProComp, Skyjacker, Rough Country, or Rancho. The PO bought a house brand from some 4x4 supply house 20 years ago. I have no idea who the manufacturer was. The test was to drive them diagonally through a swale in 4wd until forward progress stopped due to tire spin. From the front: BDS: Procomp: Unknown: Driver's side: BDS: ProComp: Unknown: Passenger Side: BDS: ProComp: Unknown: Rear: BDS: ProComp: Unknown: Conclusions: The BDS springs seem to flex slightly better than the ProComps but need the annoying +1" shackles in the front. The unknown springs on the blue Jeep are terrible in comparison to the others. You can also tell while wheeling arounds the property. It spins tires when crossed up in places the other two Jeeps drive right through. When the ProComps were still available they were a great cheaper alternative the the BDS springs. I'm a little sad they are no longer an option. BDS is the clear winner because they flex the most and you can actually buy them. Note: The test is somewhat useless since the BSD springs are the only ones currently available but it was fun.