I am completely satisfied with my purchases of about 12 or so Lee Univ. Exp. dies & the NOE plugs I then purchased to make the Lee Univ. Exp dies do what I wanted to do.
I would be surprised if anyone else who did the same had much trouble after getting the two paired together to take care of the expansion of cases for cast lead alloy boolits. If there was troubles, it was likely due to not knowing how to pair the two to mate with the caliber one wanted to expand the cases for, when they were reloading.
YMMV, of course... I think the dies paired together with the right plugs are great!