I have been using the Porterfield R4S for a couple of years and they have been very good. The dust has been low and the squek went away quickly. A couple of months ago I installed a set of Porterfield R4S's and they have just as much dust as the stock pads. I have two BMW's that both have R4S's and one has dust and the other does not. I think Porterfield has changed its compound. I am now looking at other pads. The pagids are said to be great but I am not sure about that option since they dust like crazy. The EBC Green and Yellow Stuff works for Motorcycles but I have heard they fail on the track. I am going to use them for Autocross but I drive fast when I am out in the desert. What are everyones opinions on EBC or other pads?