I have had them on the car for about 3 weeks now, so far not impressed with the Hankook's softer sidewalls... probably the first to say, but I prefer the runflats. Fast cornering stability is more precise not to mention the plain out better grip. I think I can live with the extra "discomfort" of having RFT for the extra performance gains.
Also with all drivers aid active, I still manage to get the traction light to flash, hence slippage on totally dry even pavement.
my setup is the following:
stock BMW sports suspension.
18x8.5 - 225/40
18x9.5 - 255/35
Thinking whether I should mount my OEM RFT on to my aftermarket wheels, as it will give me the handling characteristics I want, however will probably have to sacrifice in the looks department, at 215/245