"Snuffy \"Hub Cap\" McKinney"
writes:

About use life -- I installed our about 20 years ago and it never had
a problem until about a month ago, ...

My first one was an Insinkerator installed by a contractor.
It rusted out in a year or two.

When I bought the replacement I found that the lowest priced models
are not really built to last. I bought a higher end Insinkerator
and I found it comes with a lifetime guarantee, to installed by
the company at their expense. Needless to say, it's still
running, and I expect it to never quit.

--
Dan Espen