Vandersteen 2c -- Foam Issues

I'm thinking about buying a pair of Vandersteen 2c. But I'm a little worried because I have read about foam breaking down. How do you check to see whether the foam has detoriated? Will the foam eventually detoriate even if has not yet? Am I better of spending about $250 more and buying Vandersteen 2ce due to this issue? Thanks for any responses.