New Rocker Arms

Im buying new rocker arms and was wondering has anyone used the Mancini/Harland 1.6 Non-Bushed Rocker Arms on mild Roller Cam engine (Lunati 60333, 210 seat/ 550 open)? The max RPM is 6800rpm.

I have a new set of PRW Stainless steal that will be soon for sale, 1.6 bronze bushed... They Retail at Mancini for 500 and have life time warrentee.