8-year-old thread... but I'll chime in. My experience was that my air system was hopeless, and I've not looked back since putting the Arnott coilovers on the cars. I have no complaints, but I can't compare it to a working air system because I've never been in one that was working. In my situation, the expense of what my car needed simply made no economic sense, as it was a significant fraction of what I paid for the car, a cost I couldn't even begin to hope to recoup.