The devil is in the details. Can't say the mentioned problems are something I've noticed at all. There are two big differences I notice when switching between gtk2 and gtk3 for my emelfm2: 1. I actually have configured a theme for gtk2 sometime in the distant past, and I guess no other programs I use regularly are on gtk2, because emelfm2 then looks completely out of place. My own fault I guess. 2. On gtk3, the horizontal scrollbars at the bottom of the panes are missing. That's weird as they are clearly visible in the video Serge linked. On the other hand, with gtk2 when deleting a file, no file is selected after the operation, where the next one in the file-list (or previous if deleting last file) is selected on gtk3. The selection thing after deletion (or renaming) is enough to keep me on gtk3 at the moment, but without the horizontal scrollbars (or the ability to resize the columns either, another gtk3 problem?), I can't see stuff like filesize and dates. Tough choices!