My rotors arrived 10 days after ordering from China to Australia. US$219 for 3 rotors including delivery. Fitted them yesterday and bedded them in with about 150 km of riding including some with pillion and all is good so far, smooth and no shuddering. I haven't ridden for about 6 months but these rotors don't seem to have the same power as the previous carbon steel units, there is a lot of lost friction area in the slots and notches around the outside. Might try a new set of pads.
Regards, Russell
If you were indeed used to running "carbon steel" rotors you would indeed lose some braking friction switching to stainless steel as they have different coefficients of friction. Whereas in truth there is little lost friction in the area of the slots and notches around the outside as these actually increase the total amount of leading edges for the brake pad to grab at; otherwise high performance brake rotors would still be solid surface not drilled or slotted. You trade leading edges for surface area.
You should always install new pads with new rotors or at the very least break the glaze on the old pads on 60 grit or rougher sand paper; I've used the concrete shop floor in a pinch to rough up pads.