The Scorpion and Harland Sharp rockers are rated at 600 lbs spring pressure. The aluminum bodies are not going to break.Are the scorpion and Harland sharp rockers reliable for many miles? I would hope 200,000 not just 50,000. I'm worried about aluminum instead of steel in a daily driver.
The roller bearings are hardened steel and should last very long with the low spring pressures of a street cam.
Plus the roller rocker has almost no valve stem side force so the valve guides last longer.
The rocker arms can also be sent back for a rebuild.