I took delivery on a new 27" iMac the end of last week to replace my 4+ year 21.5", and after having lived with it for a few days I have discovered a personal difficulty which I'm not sure I can adjust to and may force me to return it while I'm still in the 14 day window, said difficulty being that the system fonts are simply too small, and there's no way to adjust them. I know you can change the resolution and I've tried that, but the result is not acceptable. I know you can zoom but that's not acceptable, either. Also, I find the gigantic (to me) screen a distraction, but I might adjust to that in time, but the font thing may be a deal breaker. I work with mostly text files, not video or photo editing, and I think that the big screen and enhanced resolution may ultimately make the otherwise wonderful machine more trouble than it's worth. After reading the quite different opinion of others on this board, I think I may be the only person on the planet who finds the 27" too much of a good thing, to the extent that it is counter-productive. I know this is only my impression. I may have to return it and order a 21.5" afterall. Thanks for listening.