Always heard good things about the GSD3 F1s but never ran with a set. I'm currently on Yoko Parada Spec-2's: quite progressive breakaway in the dry, never pushed on in the wet to find out how crap they're supposed to be! Quieter too than the Pirelli P Zero Nero's that come on the Cupra's IMO.
I did buy a set of GSD3's from a local tyre wholesaler, but they turned out to be the dodgy "Made In Thailand" non-EU approved tyres (not legal in the UK) so they got returned for the Yoko's after a week.