The demo is very impressive but I can't get it working. The documentation is very confusing. The installation procedure is very simple though I could not find it inside the plug-in and the module manager in the joomla back-end. It can be found only in components. Now, when working with the configuration using their documentation, in the 'Column Width' section, it suddenly shows the configuration of 'TZ Pinboard' extension !!! It may be ignored if it would work, though the 'Moderator approve' option is missing. After saving, only 'Sign Guestbook' link shows, nothing else and nothing happens when clicking on it. Moreover they don't have any support system. So, I can't give this any rating other than very poor. The developer has to work on everything to make it upto the mark.