*** Like the tires. Grip better than last two sets. Look great. Fun set of tires to play with a little aggressively. I think they're nice, cheaper performance tires. I have Continental DWS on the other Mustang and they are great also.
***
I installed a pair of these on the front of my '04 GT a few months back, and I've been happy with them thus far. Switching to these from a pair of Nitto NT555's, the sidewalls on the Cooper RS3-A's are noticeably softer, but you get used to it after a bit. The only other minor "complaint" I have with them is the "stretched look"/lack of rim protection in comparison to the same size NT555's.
I'm still using NT555's and NT450's as street tires on the rear of my cars, so I can't speak to the RS3A's traction, but I expect they would fair well for an all-season tire.