I have had this grill about 10 years and I bought my daughter an S-620 about the same time. They do wear out, but the great news is I just upgraded both with new tubes and a new manifold and replaced the worn out knob light switch, and I couldn’t be happier. The SS grates and the flavorizer bars don’t wear.  When you drop 2-3 grand on a grill, you’d like to think you won’t need to replace it. Well you don’t. Simply replace the few things that wear out and laugh at your friends who buy cheap grills that don’t do what yours can do. This grill reaches 700 degrees and will cook perfect pizza stone thin crust pizza. You can’t dream of doing that on a cheap grill and steak or rotisserie chicken are both easy and perfect every time. This is a big ticket purchase and if you maintain it, it will be the last grill you will ever buy.