I used a Vantrue N4 for about a year and a half that worked great. I gave it to my wife and bought the N5 because I was excited about its voice command feature, the ability to lock a video, take a photo etc. without having the distraction of having to manually touch a key while driving, as well as the expanded coverage area. I'm SUPER DISAPPOINTED. I have the unit on the highest sensitivity level that it offers. If there is road noise and/or the radio is playing at normal volume, it doesn't activate when given a voice command. I can YELL the command loudly, it doesn't activate. If the car is quiet, in park, the commands are heard and the cam responds. When I want to save a video while driving, my options are to turn the radio down down to zero, use the voice command and hope that the road noise doesn't negate my comment, or press the lock key, like an N4... I've been using the lock key.
The cam will not work properly with a USB connection, only a cigarette lighter plug. We all know how well those stay plugged in. They don't. Occasionally while driving I'll see the cam is not working and have to push the plug in again to connect.
The N4 is a good, simple, easy to use cam. The N5 is not.
I exchanged numerous emails with Vantrue CS, often repeating the same information over and over. I shared photos of settings, a VIDEO while driving of the issue. Nothing was ever resolved.
Had I known all of this prior to buying the unit, I never would have bought it.