Calls are surprisingly clear and low letency  at least on the same network. Requires some reading to really get how each option works. Note to some other reviews: root is only required for AdHoc mode  which is an Android design limitation. Other modes work fine. Resilience is lacking  which is forgivable in experimental stage. I find myself every hour or so having to cycle the services and Bluetooth off and on to reconnect to peers. Plus  some other apps (like OpenGarden FireChat) will kick off AdHoc mode and possibly other interference.
April 03 2017