I have had the 4 burner RED from HD for 6 or 7 years. Best grill I ever had. The trough emitters wear/rust about once every 18 months. Not a big deal to replace. The grates started to rust after a while, but I was using a Grill Daddy for cleaning that placed water on the grates for cleaning--clean with steam---long term, not a good idea. I ordered the Grill Grates and simply placed them on top of my rusted grates instead of replacing them. That has worked out for the last few years.
The only problem I have now is that my ignite mechanism won't give me a spark, so I have to take off the grates to use Bic lighter to get it started. I have changed the battery, and that worked for a few weeks, but now nothing.
Still, this is my favorite go to grill, and would buy another in a heart beat.