Avid griller and used to taking care of a grill.  I love the Broil King grills and this is my second one.  I ordered Cast Iron Grates for this one due to better searing qualities, but have been sadly disappointed, I season them about every 4-6 months and they are still rusting away.  The cast iron must be very low quality, I would reccomend sticking with Stainless Steel, BK's quality department needs to work out some supplier quality issues I feel.