Anybody have any experience with the BILSTEIN B12-Pro-Kit for the Crossfire?
It's marketed by Bilstein as a matched set of shocks (theirs) and Eibach springs.
Below is their description.

The BILSTEIN B12 Pro-Kit allows vehicles to be lowered up to 40mm. The kit has the perfect combination of sporty dynamics, aesthetics, and load bearing capacity. This BILSTEIN B12 kits consist of BILSTEIN B8 high-performance shock absorbers that are perfectly matched with EIBACH springs for an optimal ride.

They also have 2 other offerings (their shocks and Eibach springs) which are height adjustable by means of a threaded collar which I assume would be installed below the springs.
Any experience with any of them?