Very good unit so far, fitted to a BMW 6 series, the hard wire kit was soldered into the overhead lighting for power and the cabling routed around the top in the head liner.
There is a lot of cable supplied for both the front to rear camera and the hard wire kit, beware of the hard wire kit though since if your fitting it as I did (very close to the front camera) you'll be left with an awful lot of cable to hide (even when you've cut it down).
The camera's themselves are very good and the picture is clear and crisp even though the rear cam isn't 4k, very easy to setup as well, you may need a bigger card than the 64gb supplied with it though if you want to use 4k all the time, I guess it depends on what you want from it but I got a little under 2 hours video before it started to overwrite the first vids.
Haven't used it at night yet but so far I'm more than pleased considering the picture, features and the prices of other 4k units out there.