So I cloned the repo, ran install.sh and got prompted to run the git submodule checkout for jedi the first time I opened a python file.

Seems like a pretty excellent installation process (on linux anyway) despite the "hackers" complaining in other comment threads.

But the important part is that I'm really impressed by the completion ability, I've only played with it a bit but I'm leaving the rest of my plugins for that turned off and staying with ycm for now. Excellent plugin, thank you!