I've been reading this forum for 2 years and finally something to post on...
To start, I work in the oilfield selling and delivering supplies to oil and gas drilling rigs. I drive the truck daily and just turned 100,000 miles. This summer I was tired of having the dreaded rear end sag while loaded down, so I bought and installed the AirLift brand Load Lifter 5000 kit number 57212 air bags on the rear of my 2009 F-350 CC LB. I also installed the AirLfit Wireless Air Controller kit number 72000. All of this was purchased from AutoAnything.com, at the time they had the best prices coupled with some online discounts.
As for my opinion, I absolutely love having my AirLift air bags. Installation was pretty easy but time consuming getting everything perfect after I read the installation post in the how to section of the forum. I push the payload capacity to the limits daily and they have taken everything I have given them on and off road. The wireless air controller is awesome since I can increase or decrease the air pressure on the fly from my cab according to my load. I chose not to use the automatic leveling kit because many people complain that it adjusts too much. The wireless controller I bought also adjusts the air pressure in the bags with a load or after taking a load off the truck keeping the desired psi in the bags. With 5000 # on the truck it may go slightly under level but it definately doesn't have the overloaded looking sag which plagues these trucks with heavy loads. With 1 - 4000 # in the bed 30 -70psi usually does the trick. When I am empty I leave 20 - 30psi in the bags to stiffen the ride up a bit and reduce the pogo effect on the crappy Ohio highways.
The only problem that I have had is the exact one that I saw on the reviews for the wireless air controller. After about a month for some reason the manifold would dump air while I was trying to increase the pressure in the airbags. After some troubleshooting I called AirLift and they sent me a new manifold the same day. I was upset about the problem but it was taken care of promptly. The replacement manifold has been on the truck for about 5 months with no problems. Would I buy this again - Definately.
It's surprising the amount of comments I have had on them and the number of people that notice them. It probably helps the truck is a good looker. If you have any specific questions ask, I have the kit and have been putting it through the paces.