if you have 7 stick with it.
there isn't really much of an incentive to upgrade to win8. the new features are nothing to shout home about the drive storage is nothing new. people have been doing different forms of raid for years.
i really dont like metro, i ended up installing start8 by iobit on trial version and it never crashed once
i havent had a problem with iobit software yet (before you go calling me a fanboy its free software and i did try the other paid for one, i forget what its called though)