It a great thing to show only one icon representing a group of windows on alt + tab , but its pain switching between those grouped windows. I know about ALT + ` and I don't even mind doing it but with many terminal open , it becomes hard to figure out which is what with the preview of grouped terminal being so small.
Compiz has an awesome window switching features which on ALT + TAB shows preview as big as the window itself. I tried setting it up on Gnome3 but for some reasons it doesn't override the Gnome3 ALT + TAB. I m aware about ATL + ESC for switching between all the windows but its kinda buggy. What do you suggest ?