I have 3 Weber GBS Grates. One of which has been in use for a long time, at least 7 or 8 years. While the outer part of the grate is in very good condition, still shiny and clean, the center plated insert has become corroded.
No amount of scrubbing / cleaning makes it any better. It is still usable, but does not look attractive.
Called Weber to see if a center insert replacement could be purchased. In a word, no.
Thus the order was made for the 100% stainless Killa-Grilla.