Early mk4 Golf GTI Turbo with no traction control, and you could launch it hard, wet or dry, with very little scrabble. Even situations like accelerating hard out of tight T-junctions where the car used to just light up the fronts on its previous P6000s, these Primacys just grip and go. Very little road noise, good life (mild feathering of shoulders only after 10,000 hard driven miles), and gave a level of steering feedback that I didn't think the car was capable of delivering.
Very good tyres. Expensive, but worth it.