I'm the author of that clone. I'm making progress, and it's building up to a fairly nice subset of org-mode, but it's not something that would satisfy any truly hardcore org-mode power user. At least not any time in the near future.

The previous poster complained that none of the Vim plugins that try to mimic or clone org-mode "seem complete". That is definitely the wrong way to look at things. Org-mode is a huge app that's been heavily developed for six or seven years now. In some ways org-mode is probably like Microsoft Word: probably 75% of its users access only about 25% of its features, although many of them access a different 25%.

Why try to develop an org-mode clone in Vim, then? Mostly as a personal project I started for fun. I tried switching to Emacs just so I could use org-mode. Even with Viper and Vimpulse add-ons Emacs felt too clunky to me. I had previously worked on a Vim outliner and I knew that part wouldn't be too hard to replicate in Vim. I decided not to stop there and I've gone on to a lot of other features, although it's a fledgling project. In particular, I need to get some decent documentation done. There are a ton of features in my clone that users have no idea are even there. I think so far most of them (like most org-mode users?) use it mostly for simple outlining.

The Vim clone uses a file format compatible with org-mode and actually calls out to an Emacs server to have org-mode do exports to LaTeX/PDF, HTML, etc. So pure document authoring (as opposed to PIM/task management stuff), is one task that the Vim clone probably can do a decent job of now. Adding footnote support is on the list (there's already a Vim footnote plugin that I plan to modify to work with the org-clone).