I have a KW (V3 full adjustable) set up I bought from Raab Motorsport in Windelsbach, Germany who developed the set up with KW, though I've never installed them yet. They're just sitting in a box waiting..
But I did go for a ride in and test drive in Raab's shop car and it was a fantastic feeling. Quite sophisticated and modern feeling, very refined. How he had the car set up was a great balance between aggressive and comfortable, perfect for a spirited/performance street car.
For my personal preference it could have been even a bit more aggressive, but with the possibility of full adjustability there is room to fine tune to each individuals taste.
I've had KW V3 on other BMW's and thought it was great so I have no doubt It was worth the money for the e9 as well.
As for the stance, you can see Raab's car below ( sorry not on flat ground). There was still room to adjust the front higher or lower, but the rear is fixed. They were working on an adjustable spring perch last year which I am waiting for. Though I haven't checked recently so It may already be available.
Their display example
Raab's car:
My set up in black: