Calls are surprisingly clear and low letency on direct connection  WiFi or Bluetooth  but there's no packet flow control so talk slow to avoid losing syllables when the buffer plays catch-up. If however there is a WiFi↔Bluetooth relay in the pipeline  voice is useless; stick to text. A two hop text (through BT anyway) could be anywhere between a couple seconds to over a minute  but does eventually arrive. Messages currently lack an accessible sent time/date stamp. 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 06 2017