They just didn't work for me. I had a good firm pedal but it felt like Ice Mode had kicked in and whenever I needed brakes, they simply were not there. First two or three laps were OK then the pad just heated up and ceased to work.
Put the Pagids in and sorted, no issues at all.
Were they the old style or new style?
New style I guess, don't really know, they came from Camskill about a month ago.