Bought it on Amazon (blackboxmycar). Very easy to install as I already have a F770 and a Cellink B battery installed so I don't have to rerun the wires. Pretty good 4K quality.
That is why it is normal to mount the camera higher up on the windshield.
Generally you should not have the horizon lower than half way up the image, because if you do then the auto exposure will be setting the exposure for the sky instead of the road. Hence the advice, although the exposure doesn't seem too bad in this sample.