Still gotta chip in. If you did a finish cut of a couple of thousands and ran the cutter on the slow cut option and had a strap on the drum, the result, unless the drum is NG, is a good round finish. Same thing for rotors as long as they are vented ones. Unvented rotors have a horrible reputation of flexing, especially if the inside and outside cuts were done unequally. New shoes / pads on old unturned drums / rotors lead to glazing, heat cracking and soft pedal until they reseat. Vice versa too. Sounds like FT has had bad experiences, probably due to inferior products or people. These pieces have to be round, true and have to have proper tension springs. You cannot use non round, non true parts and get a good result.

Would be fun to hash this over a couple of beers with Foxtrapper..................