H&R beats the shit our of eibach suspensions any day of the week.
I had Koni adjustable shocks with H&R race springs on the last car, an you talk about go cart handling.......well that had it hands down. go threw eibach springs alone an figure out which set has springs rates that are 325 front an 375 rear or higher for our car.
eibach makes soft "user comfort" suspensions for everyday drivers.
the last time i talked to tony at newedgeperformance.com he told me to stay away from eibach because half the time the don't honor there warranty.