I have the Vorshlag kit paired with the FRPP P springs. Squat, dive, and roll were all dramatically reduced compared to OEM, and the rear axle is far, far more planted over rough road surfaces.
In terms of ride, it's typical Bilstein. Because of the digressive valving, low speed shock movements like when the car is leaning, squatting, or hitting a speed bump are firm. On high speed shock movements, though, like hitting a pothole or bridge expansion joint, the internal valving blows off somewhat, so the shock doesn't get way stiffer like it would otherwise. The effect of all this is that the ride feels firm but not harsh over sharp impacts.
Complaints: 1) On track, I would like more roll stiffness, this should be seen as a daily driver / HPDE compromise setup. 2) On bumpy roads, the springs still feel slightly underdamped to me, it feels like it could still use a little firmer high speed shock damping. (You still get the occasional 2 suspension movements instead of one over quick sharp bumps in quick succession. It might be a function of the digressive valving, I'm not sure. Lower speed impacts are nice and controlled.) 3) Visually, the car sits a little high for my taste. With my downsized 18" rims, there is some fender gap. I know we aren't supposed to care about such things in this section, but there it is.
For context, I use the car for HPDE days and year round commuting in New England and this setup fits the bill. If you are doing more of an extreme performance or dedicated track day car, I would lean towards coilovers.