I'm glad to hear there's others with Godspeed grooved discs and Kevlar pads,unfortunately for me i paired them up with "refurbished" calipers on an exchange basis,that was less than 10 months ago,car has only done a couple of thousand miles since then,but now the pistons are sticking and i even had to force the car to drive forward in the driveway to free them off the discs,not a pretty sound i can tell you,and of course i nearly shot through the garden fence!
And to top it all off,after freeing the calipers it is now obvious that the discs are warped,whoop,de frickin doo!