i currently have good year eagle f1 like alot of people on here, but i had normal bridgestone RE50's before and to be honest i had to to push the car to its limits and then some to notice any "real" difference in performance.....yes it was better but not "omg this is so good i must run out and tell everyone"
moral of the story is if you drive your car like you stole it 90% of the time then get eagle F1 if your 50/50 then just get bridgestone