"And if you're still running OS X Mavericks or below then why not try it out?" In other words: "insecure" or "unstable" - choose one. I'm all for upgrading to

"And if you're still running OS X Mavericks or below then why not try it out?" In other words: "insecure" or "unstable" - choose one. I'm all for upgrading to Yosemite, but this is a problem.