A friend had the foam in a storage case deteriorate and stick to his gun. He easily cleaned the residue off and tossed the case. He suspected his problem was due to solvent or lubricant that migrated out of his gun and damaged the foam.
So, some of the issues people have noted may have more to do with contaminates getting on the foam than any actual issues with the foam.
A major source of objection to a free economy is precisely that it ... gives people what they want instead of what a particular group thinks they ought to want. Underlying most arguments against the free market is a lack of belief in freedom itself.
- Milton Friedman