Strange how things happen.
I have F1 asys on mine and like them, good all round I'd say.
Last night I was asked by a fellow member to compare handling, 05STi vs RB320. Very different characteristics, only comparing on two linked roundabouts. The RB feels very loose, understeer coming at 40mph, enough to make you lift, then snap oversteer. The STi on the other hand began very slight understeer at near to 50mph and to get oversteer you had to aggresively lift off and provoke the rear. STi on F1s, RB on Falkens. It was dry.
At the moment I'm not saying this is down just to tyres, however as far as we know, both cars have the standard suspension from the factory, neither has any apparent faults with suspension. To further confirm this, next week the STi wheels are going onto the RB and we'll get a better idea! Watch this space.....