For me the real breakthrough was to get rid of Ubuntu and install Arch and configure everything by myself for my laptop. It was super fun, learning to use systemd and making everything to work. Having xmonad, with pretty fonts, automatic suspend, wifi, vpn and all that working. And it was not at all that hard and took me one night and a couple of beers to get everything done.

I might be different than most of computer users, but I really do enjoy doing everything by myself. Now I know exactly what's wrong if something breaks. And Arch (or Funtoo, my work distro) are much easier to configure with a text editor compared to Ubuntu (or if we go this path, to OSX). I like systemd much more than upstart or launchd. I like the idea of a rolling release, so I don't have the nerve breaking massive updates every now and then.

But if just switching from OSX to a Unity distro, for me that wouldn't be enough to switch.