I expected the aardvark to break a couple of things. They switched back from Unity to Gnome, so even more than usual, I feared the system might not even start.
Compared to that, things went quite smoothly. One problem I ran into is how Gnome devs apparently never used a dual screen setup, and thought it would be a good idea to only switch workspaces on the main screen, and keep the other screen static. Needless to say, that’s not how workspaces are supposed to work.