I tested almost 10 accordion menu including those that are very popular in joomla extensions site. I find this one is the best among all. It is easy to use and install. All the parameter is very obvious. No need to refer to any documentation. It works just as what you expected for a accordion menu. No bug find. Although there is a small advertisement statement at the bottom of the menu. You can easily remove it if you have some knowledge of php. Developer well done~!!!