I dont have any rattle on mu galfer wave, but i have very sensitve fingers so i can fell the grooves in the brake under real hard braking. To me it almost feels like a vibration but it just the rotors. Not sure why but with the galfer hh pads i couldnt feel it, but now i got hh EBC's it feels like it has way more bite but i can feel it under very hard braking. Im talking chocking it down from 150 or so down to a 30 in a heart beat. But those conditions all breaks might do that