They'll wear out, but not quickly. IIRC the Eagle Claw are the thick pads, right? I've also got a canti setup that takes V brake pads, which I wear out in a year or two. The bike with the thicker pads gets most of my riding, and lasts for 2-3 years of normal commute plus weekend riding. Although I don't do a lot of downhill drag braking -- the road I do the most on is closed because it's sliding off the mountain.