i will say my old 3" pro comp springs were stiff as hell. it didnt ride bad but didnt do much for flex. with some bilstein 5100's road driveability was awesome, like a caddy.
After that, i went to some 4.5" RE springs, which were definitely softer, and needed bump stops (i didnt with the pro comps). it rode well though, i was happy with them for the short time i ran them.