I ran the 615s this summer, in 245/45-17 on my WRX.
i had to roll the rear fenders to clear 'em but god damn did they stick good.
grip like no tomorrow, even on a fully stock wrx. i even surprised my evo school instructor with their wet grip.
he sat next to me going into a slalom, and just said, "too fast, your going to spin." i just grinned and kept my foot in it. end of the run he just said. "Nice. what tires are these?"