These pads replaced the stock pads on a pair of Cobra-R calipers. They work great - not too aggressive or dusty for a stet, but bite better than stocks. No complaints here!
These appear to be very good brake pads but they have only been in the car 2 weeks so it is difficult to rate them but expectations are high. I would recommend if you don't get new rotors make sure you grind (make) them.
I installed these on my 1994 Mustang GT along with slotted and perforated Centric rotors. The pads are definitely better than stock! I also have braided steel brake lines wherever I can attach them.
Excellent stopping power but they have the added disadvantage of extra brake dust. They will also heat your brakes more, but that shouldn't be a problem for any road car. I track my car and it's only noticeable after a few sessions as a slight drop in braking performance.