We really haven’t had much of a problem with rust, although I doubt it’s very problematic. But I guess it does indicate it’s not good quality steel.
Have a look at our recommended cages page, the company we recommend (Toys for naughty boys) there are really good and we’ve loved all the stuff from there – and they offer a good guarantee if you did have problems.
But we use the Arc and Tight Squeeze a lot and not rust at all that hubby’s told me about anyway.