[moe]

The main differences would be the overall integration and the "Vagrantfile". I.e. you can slap a Vagrantfile into your project (akin to a Rakefile) that defines what a dev-environment should look like.

Some other developer can then just check out the repo, run "vagrant up" and vagrant will take care of downloading the required OS disk-images (*.box-files), launching any number of VMs and triggering your provisioning procedure (puppet, chef, shell-script - whatever) on each.

It's still a lot of work to properly integrate into a project/CI without frequent hickups (e.g. keeping up with ever-changing server-configurations). But it's definitely a solid baseline to start from and saves a lot of work that you'd otherwise spend scripting all this yourself.