proform rockers ?

My proforms cracked one after about 1 year of use, 500lift, 350spring pressure, my buddy broke one too, and in the process one of the adjusting screws snapped and fell down on the camshaft, cracked a lifter, destroyed the lifterbore in his 340. He was running a performer rpm camshaft. I dont thrust them any more.
Look for used good ones or step up to 450 dollar and buy the ones from mancini.