I'm afraid to see how it'll run on my iMac. Yosemite did not treat it well at first. I'm usually very excited about OS X updates; more than iOS.
My poor MacBook Pro can't update pass Mavericks or it'll crash.
All in all, I need to upgrade computers. Lol Even though they were the top of models at the time. Maybe then I'll be excited about El Capitan or whatever comes next year.