I have the Nextbase 512GW which had been in the last van & transferred to new van last October. Still need to get it hard wired in though.
Has recorded a few near miss incidents & dickheads on the roads getting aggy when they don't get there own way.
Just ask them to smile for the camera filming them soon makes them backtrack.
Other option which i used a couple of years ago was an app on an old smart phone as they generally have good camera's & built in sat nav so more useful than trading in for peanuts,
Not had any issues with the 512GW nextbase though,
Hope it helps,
Andy