Air suspension systems are generally high maintenance suspensions ..especially long-term. But they can be great, even superior, if properly repaired and maintaine.
In general terms, what I learned (from working on/owning cars with air susp) is the importance of learning as much as you can about how the system operates, in order to properly debug problems and maintain/repair them. There are a number of simple points-of-failure which can crop up on an air system, many of which can be inexpensive fixes, *if* ya know where to look. Relying on shops to repair them, takes someone who is really 'up' on air suspension. Otherwise you get parts replacers who tend to want to replace the most expensive parts first.
For the DIY guys, I would encourage reading the air suspension section in the Dodge Ram factory service manual (forward and backward). Guys who want a cheap-to-own truck 8yrs down the road and don't like to dig into repairs themselves, I'd stay away from air suspensions entirely.