I have not made official test, but they seem to stop my bike faster than rim brakes.
I highly recommend the resin pads.
Not much to say except these are the exact drop in replacement for the pad on my Shimano Ultegra Di2 Hydraulic Road brakes. I removed the old pads, cleaned the pistons and brakes, put the new ones in, and the bike is good to go again.
Previously order these online from another place but ended up with the wrong model pads, so got them from Wester Bikeworks since I figure they would know their stuff, and send me the right ones ... And they did.
Pricing was competitive relative to LBS and now I have new brakes. No fuss no muss.
