After using Gnome 3/Shell for a couple months now, it has really grown on me. I have one UI annoyance that I wonder if the designers could comment on. When I'm using a maximized application like Firefox or Chromium, I often have to move the mouse to near the upper-left corner to activate a tab or use the forward/back buttons or File menu. Sometimes, rather often, I overshoot and accidentally activate the overview mode hot corner. I believe this mostly happens with Chromium since it doesn't use the standard system title bar, leaving the tabs and other controls a lot closer to the hot corner. But it does sometimes happen with standard apps too. I'm not sure how tweak the design to prevent this from happening, but I'm wondering if this has come up before and been considered.