I had Dick Landy Industries build my S/S Hemis back in the 80's and I ran DLI roller rockers on my engines. One time while visiting the shop I asked Dick what he thought of Norris rockers, his reply was pretty straight and to the point.

"This has nothing to do with them being competitors of mine, if I were told my only choices were Norris or stock, I'd run stock rockers, Norris are junk, they break"