Before I got my 13" rMBP, I assumed that 2560x1600 wouldn't be usable because everyone said it was impossibly small. As soon as I got it, I went to 1680x1050. It was great! But I needed MORE. I got switchresx and bumped it to 1920x1200. Even better. Then I tried 2560x1600. I can't go back. It's amazing: 1. I can fit an insane amount on the screen. I basically have 4 non-retina macbook pro screens. 2. At first it seemed to small, but the more I use it the easier it gets. When I want to leisurely read something, I just double right click to zoom in browser. When I need to see a detail, I just ctrl-scroll to quick zoom in on it. 3. The framerate is super smooth. Mission control feels like 30fps. If I run at 1920x1200 hidpi i can literally count the frames. It ranges from 2-5. Does anyone else do this too?