Just a general fyi.
We tried to use this plugin and experimented with it on some sites.
At first we had conflicts with custom post types, which seemed to mostly resolve with the release of WordPress 3.3 and Otto's rewritten url structure.
The plugin also has issues w/ SSL redirects and goes into an infinite loop.
Also, it has some sort of conflict with the Members plugin that doesn't allow you to update roles.
I was hopeful it might be a good option for easing the switch between dev / live environments, but it seems every bug we run into goes back to this plugin. I'm sure it has potential, but it's too young still for production in my opinion.