iMac arrived ahead of time. Perfect condition. Came with High Sierra Os system, upgraded to Catalina, now it says I can upgrade to Monterey. Probably won't do that just yet. I replaced a 2007 24" and this 27" is quite an upgrade! The screen is amazing! I would have never purchased a new one. Can't afford that but this for me is like having a brand new one. Runs great, highly recommend to everyone!