You can change the harshness on both front and rear with easy knob adjustment. The ride doesn't seem much harder than standard. I have the backs on the softest setting and the fronts with 2.5 turns of adjustment to stop the inertia of the engine causing a double bounce when going over speed humps.

The spring rates are fixed (Set poundage rating on the spring), but speak to cossymad and say you want the same as mine and he'll sort it out for you.