I've restored to a saved Restore Point several times -- usually after encountering a bit of malware or virus through some nefarious websurfing. It always worked just fine.
But then, being a Luddite, I'm using 7 on my desktops, with no plans to update. (Though I am considering a complete shift to an iMac.) I only back up my data, not the programs, so going to a cloud based system is not for me.