I've been using MP 1.6 rocker arms on a solid roller with 750lbs on the nose for the past 5 seasons. I've been considering the Mancini HS rocker arms too after we had a minor fail at the start of our current season. The fail wasn't the rocker arms fault but the cup on the Comp Cams pushrod split & munched a rocker arm. Since I've had such a good run from the MP rockers, I figured the HS must be better, right? That said I'm thinking maybe they have a 5 year life before I add fresh ones or should I just blow my budget & get the roller versions?