I've made the swap...The Sport suspension rode nice and yes the Rubicon suspension is stiffer but it definitely doesn't ride like shit.People saying your jeep will ride better with rubi suspension, I honestly dont get it. The springs are way stiffer and the shocks are alright. The ride is stiffer and swings more than the sport.
If I was to rate how it rides relative to sport I would say it rides like sh!t. Offroad the rubi suspension floats, it is waaay better. but onroad it is crap. Dont do this if you are trying to get a better ride on road. Just being honest.
Honestly,I love the ride..on and offroad.