I have a KBU24 stainless sink with chrome plated bottom grids; (KBG-24-1 and KBG-24-2).  After six years the sink looks the same as the day I bought it.  Excellent quality.  The bottom grids, which are chrome plated, were starting to show some wear. I called Krauss  to see about buying replacement grids.  They told me that the product had a limited lifetime warranty, and if I could send them photographic evidence of the grid deterioration, they would replace them.  They sent me replacement grids, and now my complete sink looks like I installed it yesterday.  It says a lot about a company when they stand behind their product like this.  This kind of integrity is hard to find in consumer products now-a-days.