Pro version includes online cloud backup, netplay and no ads. Go to Settings, then Data, to access the online cloud backup service.
All cores and plugins required are included. However, there are some caveats.
* Some games and devices may have issues.
* Some games don’t work, but many do.
* You may need to test different video plugins for games that work.
* Some video plugins may not work on all devices.
There are many translations that are missing. English may be the best option.
Only the pro version supports netplay servers. To play games over the Internet, you will need a router that supports UPnP. To play local games on the same wifi network, you don’t need UPnP.
For support, please go to either: /r/EmulationOnAndroid or www.paulscode.com
Here i.s a great guide: http://www.paulscode.com/forum/index.php?topic=15692.0
Here is how to modify controller mappings: http://www.paulscode.com/forum/index.php?topic=15812.0