Roller Rockers 1.5 vs 1.6

Scorpion, hmm....
I know somebody who used them with a mild hyd roller cam & developed cracks around the roller axle pin. There have been other examples of the blue anodising fretting around the wrap around area of the trunnion. You might find pics of these on the web. One hopeful owner suggested it was just the 'paint' peeling...
Above is why I pay extra & use steel or s/s rockers.