Obvioulsy there are different "ass sensitivities" regarding riding quality. Perhaps I may further clarify my experience: On regular driving, by good or reasonaby bad roads the difference in riding quality is hardly noticeable. What I can say for sure is that air suspension is NOT softer than the regular one; unfortunately, this was the reason why I bought it :-( .
Nevertheless, on really bad roads air suspension behaves better, the difference now is more noticeable. In my country, it is difficult to find such bad roads, unless you leave the national-regional road network and try near-offroad paths. In this case, and of course for real off-road, air suspension is clearly superior
As I mentioned previously, the feeling of a horizontal car no matter what you do is also nice. But is it worth the price? Depends on your budget and options you dismiss because of the air suspension.
So, for an illimited budget, I would recommend to buy air suspension. If you have limited budget and do not plan a heavy bad-road use, I think you can save the money, or better invest it in other options.
Would I buy it again, if I had the possibility?: No. I made my bet but never got what I wished: a softer riding :-(
EDIT. I forgot to say that tyres pressure is a factor with a great effect indeed. Moving from normal to ECO pressures the car becomes much harsher. I don't know how much gas you can save with ECO pressures, I'd like to know.