with the r1's follow the break in procedure and over the next week/few hundred miles they only get better feeling, and thats kinda hard to believe when they already feel so damn good.
buy them off ebay, cheaper there, and you get 10% or maybe 20 if you buy 2 sets, aka front and back. just make sure your buying matching rotors pads front and back.
add both to your ebay cart then buy or you dont get the discount. iirc i paid right about 200 shipped for f bodys and stock rear pads and rotors.
the other great thing is replacement pads are only 30 bucks for the f bodys.