I’ve switched to PS4 from the stock Michelin Pilot Supersports and it’s a huge improvement. The dry grip is limitless, wet grip is as good as it can be. Moreover, it made the Fiesta a much better car overall - ride is now way smoother, I’m not anymore afraid of driving on cobblestone and over bumps. On the negative side perhaps it’s a little less darty now, the sidewall is softer so it lost a little subjective responsiveness, but in the case of Fiesta it’s not necessarily a bad thing: the car feels much more grown up now, however still playful. In terms of wear, after 5.5k km of mixed driving (50% motorway / 50% spirited b-roads) the front tyres lost around 1.4mm from the initial 6.7mm. Considering you should change tyres at around 3mm, a simple extrapolation tells me they should last around 15k km of spirited driving, maybe 20k if rotated front to back. Overall acceptable wear for me. Factor in the additional safety and I say it’s money well spent. Highly recommend for a smaller sporty cars like Fiesta, Mini, MX-5. However, for a heavier car like a Golf GTI I’d look for something more aggressive like PS4S or Eagle F1 Supersport for additional responsiveness.