I have been using ISPConfig for some months now and quite pleased with it. There is a minor issue which bothers me. The "Back" button in the browser does not work. This is by design, ISPConfig interface is fully AJAX driven and stays on the same page (URL). AJAX is used in the form of AJAH, correct me if I am wrong. ( "... and HTML" instead of "... and XML"). With "... and HTML", very little modifications are needed to use full pages instead of loading portions of them into the current page...
