Roller rockers do not have side play. With high lift cams and high spring rates the stamped rockers deflect sideways at high lift. Which causes binding wear on the stud breakage push rods popping out etc etc when your spinning it to the moon. Better geometry in the valve/cam setup means your using the duration and lift correctly. No lag from deflecting parts.
Below 550 lift and the 6 billion lb springs needed with them your good with stamped. So put them on at your leisure. If you really needed them you would already know the first time you redlined it. But they are a good insurance.
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