Steve, according to my UOA's, the iron level using Dual fILTERMAGS on the Eao36 oil filter, lowered iron levels 40 - 50%.
As far as any metal particles being liberated from the hidiously powerful grasp of the Filtermags, I don't think so.
Magnetic drain plugs are very good, any iron particles that can be removed from the engine oil, prevents the removed particle from producing any secondary ones.