I've had the 325mm billet 4 hi spec kit and felt that while it worked ok it could have been better though this could have been down to the pads, it was also very heavy :shock:
I've now swopped to a custom racing 4 pot 300mm kit which is truely exellent straight from cold perhaps alittle to good sometimes as have to be careful not to hit the pedal to hard especially as I have no abs and the discs are thinner so are alot lighter aswell 8)
Never had or even driven a car with wilwoods fitted so can't comment on their performance sorry.