I have the 13" front kit and while it functions properly, I strogly do not recommend it. The paint in the calipers is soft and scratches easiliy. For a 2K deal I'd expect powdercoating. The discs are not zinc plated and they proudly display a ring-around-the-collar of rust you can clearly see through your wheels and can do nothing about. Finally they pulsate under moderate braking. Not under light or heavy use, something about uneven deposition of pad material. Besides, 6-pistons will always be cooler than 4, even if the effective difference is essentially non-existent.