This is interesting hearing you and @SNLC and others state this. If you read the forum they are making it seem like they are close to coil sprung rigs.I've a set of the parabolic's as well. I'll add that they are very stiff. Fronts with a winch and bumper are pretty happy. Way too much overload for the rear springs. I modded mine a bit to work better.
If you're going to SAS, hit me up and take my truck for a ride. Pretty good now. Not perfect, but I'm not as disappointed as I initially was.
--r
I feel like mine rides really well for leaf sprung, minus washboards and jarring potholes. I was hoping parabolics might be the answer for the rest, however maybe I should just invest in better/tuneable shocks.