Finally the video with some info.
But does it log the info? Is the log available and verifiable?
If the car still hits you, could you make a persuasive argument about the information you had available to you? Could you argue the vehicles speed, and that you thought the vehicle threatening?
You're given some info that may affect your riding behaviour. It seems to me this info needs to be available when the day comes that someone using this is in court trying to obtain damages from a driver that has hit them.
If the info is not available or verifiable (inc' source code for the radar), then I personally think it's better to not have this device and spend the money on brighter lights to begin with.