Yeah, I read Thorn's bit about using heavier steel for the disc brakes and how the four horsemen cometh... i've ridden a steel disc fork(Kona's p2 3x butted) for a while and won't complain. It does flex under threshold braking, but that I suspect is only because of an un-true rotor. No "noodling" on the descents and it tracks straight. As for vibrations and small bumps, that is best dealt with by using the proper size tire at a reasonable psi - not by using a special rigid fork.