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If history serves right, I upgraded to Windows 7 around 2-3 years after it was released, and I still had occasional blue screens or hiccups. About one year later it finally started calming down. Now, in 2016, I could run my machine indefinitely without ever restarting (if not for updates). It's that stable. Going to wait at least 1-2 years before upgrading. I don't trust big companies anymore.

I think the OS itself is stable, but once you throw in a bunch of rushed drivers, a bunch of software that was 'fixed' to run on the newest windows and another bunch of outdated software, then something is bound to break.