I'm using whatever came onboard Fedora 19 (it says 3.8, so I guess they must have changed the numbering since).
I like it ok apart from a few annoyances like the windows jumping around when my cursor goes into a corner.
I put the "gnome-menu" shell extension on it, and dock on the side with 99% of the apps I regularly use (which would be 6), don't really like or use the "activites" thing. I really like that Nautilus file browser does split pane, but I think that's been done away with in newer releases.
I tried some 'lightweight' de's like cinnamon and mate, but they were relatively unstable and feature-poor.
EDITED: 23 Mar 2017 16:24 by DSMITHHFX