Those rotors look pretty worn, that's a bit of a shelf of a groove. Personally, I would check out all the brakes for wear, rotor warp first before I threw down for balancing, if the rotors are even a bit warped balance will be a waste.
PS I'm not shocked your perception of the brakes compared to GM is stellar, Porsche cars all have awesome brakes. And the handling... Why I demonstrated that to a tailgating BMW coupe on the off ramp, seems his sedan doesn't have the chops in a tight turn.
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