I recently found this, and it is BY FAR one of my favorite plugins. Big claims up-front, perfect delivery in action.
I have used this on heavy, complex custom sites, and it works. No fiddling with databases, no 40min x 2 ftp-transfers with the wp-content-folder. (12k files in ftp download, AND upload)
This plugin... Just set up WordPress, install plugin -> Import duplicate. Everything. Just. Works.
For developers and niche marketers: You can make your own "WordPress site template" with your favorite plugins,settings and themes. - Then duplicate the entire setup whenever you want to make a new site, all in 10 minutes.
My biggest concern now is installing older versions of WordPress on sites I want to duplicate to ensure compatibility.
This is my first review ever, and it is well deserved for the developer. I'm saving hours every week using this plugin. Thank you.