I really enjoyed using Snow Leopard, skipped the Lion and Moutain Goat upgrades but did go with Mavericks, had no problems whatsoever, plus Yosemite has been fi

I really enjoyed using Snow Leopard, skipped the Lion and Moutain Goat upgrades but did go with Mavericks, had no problems whatsoever, plus Yosemite has been fine for me, if not a teeny bit sluggish for me. But what widespread stability issues have you heard of? I haven't had any problems. I am still on Mavericks at work, thank goodness for the fix for multiple screens as Mountain Lion would be useless!