Hehe. Cult for sure. I am guzzling the Kool Aid with a big grin.
Apologies in advance for the long stream of consciousness post...
After scouring TMC forums for weeks, this is what I've learned about Active Air: It certainly helps with raising/lowering, load leveling, maybe reducing lean in corners, and definitely smoother ride. May help performance a bit by increasing contact patch. However, if you look at the rest of the automotive industry, the best handling cars out there all use standard springs or MagneRide (
http://en.wikipedia.org/wiki/MagneRide). Air suspension is mostly relegated to SUVs, Citroens, big luxury boats. There are a few notable exceptions with air suspension like the Audi RS6 Avant.
I think MagneRide is more high tech, better performing solution. I wonder if Tesla included that option in their trade space and discounted it for some reason (Cost? Delphi as supplier?).
At $2250, the air suspension option isn't expensive, but the added complexity always increases risk of something going wrong down the road.
Bottom line to OP: IMHO Active Air is worth it for improved body control, better ride. MS is, after all, a heavy car with distinct dynamics (because of low low CG) and we can trust that the engineers did a great job taking the chassis into account in these design decisions.