Yes I did... Ran a couple Erson cams back in the 70's, good stuff.. We never really thought about cams going flat back then, they didn't need anything beyond normal break-in....Did you notice the cool rockers Erson had back in the day, 1.5 AND 1.75 ratio.
PBM performanceI used a couple Erson cams in Hemis and they worked really well, also in a 340 and that one was great too. Much better results than Isky or Comp. I forget who bought them out though.