Another Weber bbq fan here.
We inherited a Weber from my DH's grandparents. They bought it back in the late 80s or early 90s, used it for about 15 years, before they gave it to us because they found it too big. It's still going strong, with no hint of rust, over 20 years later. We did have to replace the grills, as those had rusted, and the burners, which were clogged up. We keep it covered but it spends its time outdoors in summer heat, rain, and Canadian winters.
If we ever have to replace it, I'd get another one in a heartbeat. When we bought our house in 99, we received a cheapo bbq as a housewarming gift (before we were given the Weber one). It lasted 3 years before it rusted through and fell apart. It's worth paying good money for something that will last and that will keep its resale value.