Stiffness is pretty much stiff, but the drive is great. They were great when fitted to my R27, improved it no ends and I think much the same with the 200.
I would recommend them to anybody with a 197 or 200.
Think I'm going to be keeping the wheels in the anthracite for the moment.
Oh and Woody as for the percentage tint - I haven't a clue, as the windows were already tinted when I bought the car.