I still don't think the plate material makes that much difference in feel. Plate vs. no plate, yes probably. But material, not much. I know i'm in the minority here, but I believe (again, not the majority opinion here) the vibrations from the switches resonate through the PCB and and then wherever it attaches to the case. The biggest difference is the case material and sound dampening between the case and the place where it contacts the PCB.
This is my experience with 10 or 11 builds.