Zone is the sister company of BDS. Both make great lifts, but I chose BDS because they have a NO FINE PRINT NO QUESTIONS ASK WARRANTY. A distributor down the road from me sell BDS for many years and he said only 1 BDS spring came back defective, and it was a Toyota P/U that got into a car accident and it somehow broke the coil spring and BDS just sent him a new spring. I had Rough Country 3.25 lift but its very rough especially going over train tracks and their shocks leak, Springs sag for sure, some reason the 2.5 rears with 3/4 spacer never really sagged but they are rated 115 lbs spring rate which BDS is 200lbs rears and OME is 216lbs. I have an LJ so its a little more heavy and plus hardtop I feel BDS, AEV, and OME are the best but AEV is discontinuing their TJ line of suspension coil springs, So down the road if I have a problem with the coil spring they won't be able to replace it because it was discontinued, OME is great also but they are very expensive, and BDS is a reasonable price and best bang for the buck!