Simple and easy to use
The main advantage is ease of use. The initial setup was mostly not required. The database already contains a test user, so you can start testing right away. The VPN server was tested with TP-Link Router WR841N in L2TP mode. The speed is not bad, no breaks in communication have been detected yet. The server allows using concurrent connections, so I also connected PC (Windows 7) and 2 Android smartphones with the same credentials to the server for testing. At the moment no problems were found, but it is not entirely clear how long it holds the VPN connection for the Android device if you are offline. The disadvantages include the not quite familiar user control panel, which will have to be studied further. Also, if you build a complex network configuration, then probably you may need to change the config files (I don't have such a task). So, generally satisfied.
Please note that IP address is reserved for each user, which greatly simplifies the creation of corporate networks .