I remember drums before RIMS. RIMS helped when talking about thick shells that had 7/8 or 1" tubes that penetrated the shell. But taking my tama drums for example, they never had tubes entering the shell. So going to DSS mount was a SUBTLE difference at close range. What made a more prominent difference, would be going from gigantic hay man or dw/camco sized lugs to tiny single-point lugs. That removed a LOT of surface area being clamped by metal and a lot of weight on the shell. My 1986 tama direct mount works just as we'll as YESS direct mounts in that respect.