I just had them installed on my present coach at the Quartzsite RV show in January. The coach would lean more than I wanted going around corners on the highway and would also rock back and forth going in and out of uneven driveways.
The difference is night and day. Going out of driveways it will still lean a bit but the motion is much slower and it only rocks once slowly instead of back and forth several times. Also, going around corners at highway speeds, the coach lean is much less, meaning I can maintain much closer to the speed limit when going around corners.
IMO, they were worth the cost to control the side to side motion.