Squeal they do! It's great to hear every dog in a five mile radius start to bark when I come to a stop sign. I have the Modolo pads on the Trek 670 I got from lotek. The anodizing on the rims is coming off, but I imagine that would happen with any pads eventually. The pads also spray a nice black residue on the fork and the seat stays. I'm thinking switching to Kool-stop blocks for better stopping power. The sinterized pads give a nice, firm feel through the lever, but feel like they are just sliding across the rim in terms of grip.

I don't want to thread jack, but does anyone know if these Kool-stops would fit into the Modolo sinterized holders? Is it even possible to pull the old pads out?