Nice work joeyespo, it's definitely a much-needed step forward. NFS, though, is a huge pain point for me on OSX performance-wise. The only reliable solution I've found so far is Unison sync between Mac & Vagrant (Ubuntu). That also comes with some caveats, as Unison has to be compiled with exactly the same version & dependencies on both OSX and Ubuntu.

If anyone's interested, I've created a list of steps involved in making it work on El Capitan: https://gist.github.com/pch/aa1c9c4ec8522a11193b