If you run EIN (Emacs Ipython Notebook module) in emacs with vim keybindings (via spacemacs or evil mode, or some other distribution/mode) you can get some pretty great results. Would definitely look into it if you're either already using emacs or willing to try it out.
I tried it at some point, but a minor inconvenience was that it kept adding superfluous metadata to the cells I was editing.
Since some of the notebooks I work on are collaborative and versioned with git, this was painful for reading diffs (even more so with the ipynb format) so I dropped it to my regret.
