I dont want to chime in too much, but my experience is the bags improved the ride and performance a lot.
The truck rode so much smoother when I was able to air it up to get off the helper springs. I felt like I was driving a Cadillac at first.
Over-air it and it gets stiff of course, that's how it works.
The guy who felt top heavy, (a page back now and I can't see it) were your bags under the frame and over the leaf springs, or if coils, were they in the coils? Running bags inside the frame will most likely always cause a top-heavy situation. That is a KEY detail when hearing air bag stories.
There are aftermarket air bags that put the system where the axle bump stop is, inside the frame rails, and this seems like a terrible place to lift the suspension (unless you are just towing). I don't think TCs are the critical design point of air bag manufacturers.