My car isn't as slammed as most:
I have 3.75 inches of clearance from the ground to the bottom of my front sway bar. I can go over speed bumps with no issues at all and the same with driveway entrances. If 1 was softest I run 1 in the front and 3 in the back. I have no problem with the stiffness and the car grips like a mofo. I do have issues with my collars coming loose tho.