I had a couple of Sears units that as far as I know, are still in use
after 15 years. I have a Genie screw drive type now in a new home. The
Sears units were chain drive. The screw drive is MUCH more quiet, and
I don't have to deal with chain wear/tension issues. Just grease it up
good once a year, and that is all that is necessary.
My son got about 10 years out of a Genie chain drive, then replaced it
with a screw drive model a year or so ago.
I think a lot depends on just how much use they get, single versus
double door, etc., etc. Figure a morning's work to replace one, and
price less than $250 usually, so 10 years would be more than