I regret upgrading. My Mac was wonderfully stable before the upgrade. Now it periodically crashes, as in full hard crash/reboot. Sometimes it fails to recognize one of my two external monitors, and when I wake it from screen saver or screen off (energy saver, but with laptop still running), it flashes the three displays a while and fumbles around trying to decide what goes where before _finally_ allowing me to unlock…
That said, I strongly disagree with forced version upgrades.