I had 50,000 miles on a Kelderman 4 link setup on my 05. This is the system that the 2014 and on factory system is modeled on. Great ride and no mechanical issues other than what was self inflicted. I popped a bag because a bracket was rubbing on it, a ten minute mod with the plasma cutter and a new bag and back in business. Similar to changing a tire. Hardest part was ordering a new bag, and even that was fairly easy through Kelderman, had it within a week. I could've driven it around that way but chose not to.
I did tow my 13k lb toy hauler home with one bag out. Down Cajon Pass, a 6% grade for miles... The ride was less than pleasant, but I never felt out of control. There is a rubber bump stop built into the bag so you can limp home.