[Legion]

80%? Every attempt I make to use a Vim emulation mode doesn't get 20 seconds without failing to replicate Vim behavior on even fairly basic things.

[Derbasti]

Then check out Evil for Emacs and ViEmu for Visual Studio.

ViEmu even supports something like nnoremap in its .viemurc.

Case in point: My first introduction to Vim was through ViEmu.

[qu4z-2]

Alternatively VsVim for Visual Studio. I prefer it, although I couldn't give any reasons why.

It still fails the "Does it break flow by not implementing some feature or other?" test fairly frequently though. First thing that comes to mind is that while it has text objects, it seems to be lacking "tag" though (vit, not vi<). Which is a shame, as it's quite useful for web dev.

[weaksauce]

What features do they fail on typically? Have you tried Xvim? It's far from perfect(still alpha) but it's got a lot going for it. It turns out Vim has a lot of features and it takes a while to get to a polished state.