[HO455]

My Burban had bags in it when I bought it. They were just about the cheapest set up available. I put a fair amount of time and some money in to improving the set up. Still a manual valve system but I have learned some important things. You are correct that every time you change your ride height your alignment changes. Small changes in pressure make real noticeable changes in ride and handling. Larger bags make for a bouncy ride and smaller bags make for a stiffer ride at similar ride heights.
If ride quality is important to you then be prepared to spend a lot of time dialing the system in. Getting the right ride height and quality of ride means that the bags have to be at an exact pressure at ride height. I have no experience with electronic controllers but the physics are the same. The controls will hold the bag at pressure or level depending on what system you go with. But the bag will still have to be at the right pressure at the right height. Electronic controls will also make the annoying small leaks a non issue as you will no longer have to add 5 PSI to a bag every 30 minutes since the computer does it for you. If you have never gone down this road before there is no way to know what the right set up for you is. Currently I am still not happy with mine and plan on pulling the lower cups and cutting about 3/4" off them to get a higher pressure at the same ride height.
The front shocks are not to hard to make work but the rears will require reconfiguring to make them effective. Lots of information around these parts on that. Rule of thumb on shock selection is bags are bouncier than springs so you want to go with a stiffer shock to compensate. I didn't and now I'm looking into replacements for the fronts after 3000 miles. They just don't control the spring action of the bags properly. Check the WMB thread below for more details on what I did. In hindsight I should have left the rear bags in (for load handling) and gone static in the front.
Many folks will disagree with me but I felt it only fair to offer my experience's up on this as it is not an inexpensive modification. For me the best part is being able to drop the truck when I wash that quarter acre of sheet metal on the roof.