From what i've read even Newmans have had problems with lifters breaking up! As you say it really is luck of the draw as to the quality of the lifters, and cam blanks.
To be honest unless there is by some miracle almost no wear on this cam, i'm going to stick a standard cam in! They are the best profile for power vs low down torque and only cost £75 with a set of lifters
Can afford to ruin a couple of those and still have not spent even half as much as say a Kent or Piper kit.
Couple that with one of Stu's new high power magnetic sump plugs (aka CVH Cam Collectors) and i'm good to go!