@toolheadDon't have any of the very newest standard ones, but they are thinner material, fewer rods & frankly, a tad cheesey...................
Caring for them comes in different shapes & sizes....so to speak......
I'm in the "coat with bacon & beef grease" camp, while others may clean them better / more often...
If rust occurs, a bath of vinegar, water with a heavy sprinkle of baking soda after the soak will pull the rust up & then we're back to the "coat with bacon & beef grease" idea to keep the rust at bay.......
I would think they'll last more than just a year or two & then the rust clearing plan comes in......I have ones that have been going for at least seven years......however, I have a ton of grates so none really get used like everyday perhaps like some folks might......rotation is a friend !!!!