When i got mine put on the back did feel a bit loose... but i put that down to the fact that i was replacing Contin SC2 that had done 30k, so were really well scrubbed
Now mine are fully scrubbed in and are wearing perfectly... no 50p inside edges or funny noises at certain speeds.... just great grip, and like Mike says... great feedback. Just wish i had the wedge to get a B12 kit on my car, as I don think Im using the tyres to their potential.