I've run Pro-comp, superlift, rancho and BDS. Want your truck to handle great on road? Get rancho or pro-comp. They have NO flex and they ride like you have no springs. Superlift soft-rides are good. They are a good choice if you want a spring that will flex ok but will still be stiff enough to help control axle wrap and haul heavy stuff. BDS springs are the best for the $ IMO. I have ragged on my front 6" springs and they have never even wimpered. And if they do, I will take them back to the shop I bought them at and go home with two new springs, no questions asked. My kind of warranty. Oh yeah, they flex like mad too!