Regarding strength--i've got a MagSwitch branded feather board that i use in all my table saw ripping, it's never moved even when i set it too tight...
I'm a hobby woodworker--and started with a used Delta 12" planer, sold and bought a used Dewalt DW733 (the old version of the DW734). Then sold that...
There was a change in the frame on the MBF's at some point, needing bracing to make it more solid--but i don't think that happened until the 1960's. ...