For those of you who have used a brass plate - is there any noticeable difference between brass and aluminum?



I believe it strongly depends on the case design and materials as well. For instance, if your PCB and plate are bolted to the bottom case, and the case is very rigid, even aluminum plate will feel quite rigid (examples are 60% type cases with drop-in PCBs or Lightsaver). If your case is like LZ-GH or KMAC where the plate is screwed into the top part of the case and then the PCB/plate are suspended over the bottom, then some plates will be "springier" than others (yield a bit more as you press down).'I think in this case, if I understand these diagrams correctly: https://rama.works/#/m65a/ the plate+PCB will be screwed into the top and suspended over the bottom part of the case. So aluminum will be the most "springy", steel probably the least. I've read that brass is in-between, but cannot attest to that from experience.