So neovim is usable now? Do you run into many problems with it?

I have been using it for months without any issues. It is actually a bit faster than regular vim.

So far the only issue was some slowness when it uses xsel over ssh. I don't think it should take that long because of network alone. Otherwise - it's very good.

The only thing I've noticed is that I can't get italics in the terminal.

How's the plugin situation these days? Will an existing (pathogen-powered) configuration work pretty well with neovim these days?