There's not much love for these cast iron grids but I LOVE them.  They hold heat for perfect searing and a more consistent temperature.  Yes, they deteriorate, but they are iron.  Mine have been going strong 7 years now and I'm going to replace two because they are getting thin, but that's the nature of anything that has wear and tear and lives outside.  When the day comes to replace my grill, I'll be looking for these grids!