I have ST's. Great coils. Though they're not adjustable except for height, they're very nicely balanced to be decently stiff without too much sacrifice in ride quality. They are definitely equivalent to nicer (and more expensive) V2 or V3 coils from KW, except... you know... always stuck on one setting haha. Just happens to be a very good setting.
I'm loving the wheels, and the car looks great overall. Nice, man!