I haven't added a lot of add ons to my OSC store, simply for the fact that a lot of them are too complex and not compatible with others. This was simple to install, set up and customize. The add on is ready to go out of the box... but again.. I've customized the modules to do exactly what I wanted. Very professional mailing system - clean - simple - and WORKS! Looking forward to the endless possibilities this add on has to offer. Thank you.