I have FCD plates on both of my MOS Glocks; a 19 and a 45. I don’t shoot enough to have really wrung one all the way out yet, but I did put 952 rds through the G45 setup in a Gabe White class last weekend. The Ameriglo backup irons failed (rear drifted out to the edge of the dovetail) but the optic and plate were fine.
That said, my buddy @karmapolice probably has north of 20k through the same setup on a pair of G45’s with no issues (optic and plate-wise; he had the Ameriglo failure early on and switched to Heine. I didn’t listen then. I have now).