I only have 3 of his molds but my experience has been the opposite of yours. Mihec's molds have been quick to break in and start casting/dropping beautiful on spec boolits.
That said I have not gotten a bad mold from NOE either.
The only complaint I could possibly have w/ Mihec's molds is the long wait to get them but I know that going in on a group buy.
I bet if you put your MP molds up for sale you could sell them fast if they aren't beat up.
jmsj