They are all pretty easy to install, I like the simplicity of the Firestone & Aircell kits and at $170 to $230 they are pretty cheap, but for $308 you can have a fully adjustable air system! I like the fact that you can load up a trailer and then add air to match the load.
I just went looking for a system for my Tahoe, all I could find is air bags for my coil suspension and I'm thinking about getting them. Thanks a lot for planting this seed!