I have never had a mouse whose buttons failed until I bought a logitech. Every person I know raves about them until you ask them how many they've had to buy.
I won’t claim to be a statistically representative sample, but from my experience their high-end stuff is expected to break after between 2 to 3 years. I kept going back to them because the hardware is very nice when it works. I gave up and bought a Razer Naga about 3 years ago. Hopefully it fares better in the long run.
They're mostly M100(?) mice from the MK120 combos. They basically all start doubleclicking eventually.
They're not all from my personal computer though, probably from about 8 different PCs.
OTOH, it speaks terribly of their quality; a mouse should work fine for 10-20 years, like some mice from 20 years ago.
And I say "replacements" because they all didn't last very long, until I got the memo and started buying decent stuff from brands like... logitech. And then there is the conundrum of going with something even more "premium" than a logitech, there's very little guarantee it's really gonna last. You may be paying twice as much for it but it still ends up lasting about as long.
I wouldn't buy a cheap mouse from them again.