I have a Weber Performer that has lasted about 9 years so far with the only repair I needed to do was replace a nut in the lid holder. Other than that, I can see this lasting another 10 years atleast. Prior to becoming a Weber fanboy, I bought cheap grills that lasted a year and the next year I was buying a new one. Weber lasts and has parts readily available if you need to do a quick repair/modification.
Yeah, the availability of replacement parts is great.
Besides the 22" kettle, and 18.5" WSM, my 2003 Genesis Silver A is still kicking around. It's in phenomenal shape for a 14 year old grill.