Overall good price/performance ratio. Used them on a mondeo 2.0 TDCi tuned to 186 HP 408 Nm. Could chase a BMW 330CD chip-tuned by me, and it was fun! Rear tyres suffered from uneven wear, got worn out on the inside quite fast - must be a wheel alignement problem. Had a puncture by a screw on a highway while chasing some italiano in BMW E90 at 190+ km/h (120+ mph) - rear left tyre went flat. Nothing really happened, the car became a bit gummy, and let me know something was wrong. I released throttle and drove about one kilometer at 110 km/h to get out of the tunnel and then stopped on a SOS place. This tyre sure did its job - even when flat!
Otherwise this tyre can be driven very sporty. You still hold the control of your car even when oversteering through the corner. Very good in dry, a bit worse in wet, it really depends on the type of surface. Very loud ride - I don't like it. Maybe that's because of uneven wear on the rear axle. Fuel economy went worse for a fair bit when switching from 215 mm GY Ultragrip-8 to 225 mm Sunny 3970. They lasted 30000 km (a bit less than 20k miles). Fast speed stability ok, was quite confident even at 240 km/h (150 mph). I don't know if I'd buy again, I really disliked the noise. It didn't bother me when I was alone in the car, but trying to talk to someone at 130+ km/h was almost like in a rally car. If they were quieter, I'd probably buy again.