My roomate is running the 15" Azenis, and they have amazing grip. Only problem is a shorter lifespan than other tires due to the softness of the compound, they get kinda torn up at an autocross event. I've also heard of problems in the rain with the Azenis as well, but he hasn't been able to test them in the wet yet.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget