HDs will improve cornering and high speed stability, but will give a more "busy" ride, as they react very quickly to surface imperfections...when you hit a bump, the event is over quickly, whereas with a comfort-oriented shock the event is longer.
Does that help??
"If everything seems under control, you're simply not going fast enough" --Mario Andretti
1995 E500 street car
1986 Porsche 944 Turbo S track car