Junk but may be OK if you like travelling in straigth lines.
I know of several people who have fitted those air suspension systems and bar none those cars come up for sale pronto.
I've built several cars with Ride Techs system for customers. Most of the parts are from semi tractor trailer systems. I can't say how they handle. I don't thrash a customers car. I've never had someone ask to reverse it or change it to another set up. I did have one guy lose a line on one wheel. The result was the car had to be towed because it dropped to low to drive.