I installed the Henderson's Super Steer units on my bus 1/2007. The handling is much improved at highway speed, that is lean in corners is a lot less and adds a much more stable feel to the driving experience. Although the effect of passing trucks was not bad before, this also improved. I do not see any real change when speed bumps are involved, just have to slow down. I have been very pleased with this upgrade.
One note, when dumping the air bags to level the coach the auto level system (HWH) dumps for a predetermined time then the jacks extend. If I want to be lower, such as when accomodating a slightly out of level parking spot that leaves the entry step higher than I want, I first dump some air from the system then go thru the leveling cycle. This is because the air escapes slower from the bags with the MC system. Hope that's not confusing, but it's just a heads up, no big deal.