Why do you prefer the 27" screen? What can it do that I wouldn't appreciate because I haven't had that experience? What are the advantages over 21.5" screen size? I'd appreciate your experience. I need to replace an old PC desktop for the family and am debating getting an AIO PC touch screen (24") or a iMac that I'll set up to run both Windows (for a few Windows only apps we use) and Mac. We will use it for some games, but we're not serious gamers. I plan to keep it for some time (versus laptops we update more frequently). I've read the pros/cons of the 21.5" vs. 27" which mostly have to do with specs, not usability of the screen size. At the store, the 27" looked HUGE. But I'd like the desktop to have features we can't get from our laptops and the size could be one of them. Unfortunately, using it as a monitor for my Macbook Pro Retina doesn't seem to be a feature. I'd appreciate your input!