I've been using this new-to-me iMac 2017 27" for 12 days now, lots of hours of graphics work, multiple browsers, youtube video, etc. It's running fine so far. No problems other than when the computer arrived I found that the Fusion drive had been split and appeared in the Finder and in About This Mac as two separate drives. I went to Apple support and found their how-to to re-fuse the drives into a single Fusion drive. I followed the directions for the OS that was out the year the computer was first sold, and that fixed the problem. So, now it works great, looks clean and unscratched. The keyboard and mouse that come with it are about as cheap as you can get, but the computer works great. One star taken off for the Fusion drive hassle.