I love the kit... the Bilsteins are holding up just fine. I have gotten them quite hot on several occasions, but never to the point of fading. I think that I will eventually replace the front shocks with a remote reservoir shock, but perhaps wait on the rear as it doesn't seem to get worked nearly as hard as the front suspension/shocks do.
The biggest benefit to the system is the DP rear springs. No more expansion joints or speed bumps kicking you in the backside on road and offroad the faster you go, the better it soaks up the bumps.
With my job change, I have a new business vehicle, so I don't drive the truck much anymore, so the kit probably has less than 10k miles on it... maybe less than 5k, but I haven't noticed any sagging in the springs front or rear.
The next project is the 4 wheel camper or all terrain camper. I hope the DP springs will be up to the task as the camper wasn't in the plans when I made the decision for the springs, if not, I may have to look into adding the Carli long travel airbags to supplement the DP springs or go back to the stock leaves with a minipack or something.