The chrome rims on our GS hold air just fine. But, the barrel of the rim is a mess. All of the chrome has completely flaked off every rim. Thankfully the outside of the rim still looks OK.
Even our Firehawk rims are starting to pit ever so slightly in the barrel. Those are made by SLP. Of course, that car has never seen snow, much less even a drop of rain.
If it bothers you a lot, you can send them off to be given an acid bath, then redipped. Kinda pricey, but it is a solution.