[ThatGeoGuy]

I've been using the plugin vim-slime (https://github.com/jpalardy/vim-slime) recently alongside tmux in order to do REPL development in Scheme / Python.

To be honest I found it more straightforward to use, and the great thing is that it doesn't require any Swank servers to run, and it works with just about any REPL based language. I find it hard to live without it nowadays, though if you're on windows I would expect you'll have difficulties in using this.