I have the Loadlifter 5000 Ultimate with the WirelessAir remote. Also have the heavy duty compressor. Works awesome! Airlift has a 60 day no Questions asked return policy. I know it works cause I returned my Load Controller dual control for a WirelessAir control setup! I just had to pay the difference in the price of the two.
I installed the SmartAir system a couple of years ago. Works like I expected (hoped) it would. Truck rides the same height loaded or empty. I would install one again.
My install may be a little different than most. I installed lowering shackles, removed the factory overload springs and installed the bags and SmartAir.