not a bad looking kit, but it gives way too little info. It mentions its a 4 piston caliper, but fails to mention the size of the rotor or how it bolts up. it would also increase rotational mass to a greater or lesser degree depending on the size and weight of the rotor. It would add some nice eye candy to the mix, but until someone tests them, I wouldnt want to be the guinea pig. Perhaps you are braver than I. I also would be reluctant to upgrade the rotor size since I am considering running 16's for race tires and obviously wouldnt be able to run larger brakes.
really depends on what you want the final outcome of the car to be.