I have Swiss Stop yellows and at first I didn't think they were as effective as SRAM defaults. However that was comparing Swiss Stops on 404's versus SRAM on alloy, which isn't fair. The SS yellows also squealed A LOT when I tried them on alloy. That went away. I haven't done any vigorous braking on the SS yellows because I bought them to use with Zipps, which I didn't intend to use on hilly terrain.