I use Kool Stop brake dual compound pads on a cyclocross bike that I use over unpaved roads and paved roads. I have tried several brands, but none did much better than provide a coasting stop. These Kool Stop pads provide a sliding stop if I want.
Replaced worn original brake pads with the combination version of these. They have outlasted a set of tires, ands still have some meat left on them. Using them on 700c rims with no problem.
When I leave my house the driveway starts with a 20% down grade and the street continues with a 15% downgrade for about 13 mile. Regular brake pads wear enough on one ride to require adjustment. The Kool Stop salmon pads (I got the half black, half salmon) stop well and wear for a long time. The bike is heavy, with an electric assist for getting back up the hill.
I've had similar results with the small rectangular pads on an older bike.
These pads have to be adjusted just right to avoid loud brake squeal. Requires a little toe in on the trailing edge.
I recently installed the Kool Stop Dual Compound brake pads on my cyclocross bike. After racing the Iron Cross 100K last weekend I can tell you that they were awesome. It greatly increases confidence on fast single track and fire roads knowing that you can actually stop!
I had some brake shudder and squealing on my touring bike (Tricross with carbon fork and Canti brakes, 700c wheels). The original brake arms where the kind where you can replace just the pad. I suspected that the arms had play which was causing the shudder. I put the Kool stops on and immediately the problem was fixed. I'm giving them 4 stars because stopping power is not fantastic but better than the originals. Using these for loaded touring and commuting.
With the amount of rain here in the Pacific North West the Salmons are the only way to go. During the summer I run the blacks of the same. The only thing to watch out for is the metal the pads get embedded in them as they are soft stick pads.