Integration with membership plugin

First of all, thank you so much for developing this plugin! I have been jumping through hoops to pull this off with some of my current sites.

My one question is, what all is synced across WP Installations? I use a membership plugin on some of the sites and In some cases it would be nice to allow users membership to be valid for multiple websites. Can someone provide a little more info on exactly what all syncs and if cross-site membership is achievable with this plugin. (Even if it isn't, you guys are my heros!)

Thanks for this!
JohnS