The Starion and the previous (E10) had ECS first.
The e30 had active ecs which used alot more sensors to adapt the ride dynamically. The E50/E70 had ecs too.
It was fitted to the highest spec 2wd E30's (in the uk we got it as an option, $$$) MIne works and its absoloutely magic to drive with. I swapped the whole setup on off of a JDM e35a Galant MX, compressor was knackered so a replacement came from the US, I brought a set of struts back from the Philippines and bought a set from Austria. They are the weak point, the air bag runs between 70 to 120 psi. If you jack the car without putting it into "high" mode the bag can roll, and this will wreck it (certainly at this age). The struts are expensive new appx £600 each at the dealer. If i could get a reubuilder to rebag the struts that would be cool.
The biggest thing with the ecs is if a bag fails the car is on the deck, as the bag supports the car, the spring is there to narrow the bandwidht the suspension has to modulate over.
There is a stepper motor on each trut to modulate the damping and thats basically the business end.
In short its a fantastic system when it works...
Rich