I have a Blackvue DR400g II, and the image quality has degraded significantly, presumably due to heat. I understand that the heat issue is probably been fixed for the DR500, but I still must caution against buying anything from this company. I have been unable to get ahold of anyone to file a warranty claim. They simply ignore my messages submitted through their website, and they provide no other contact information. There are also numerous stories of them denying warranty claims, due to the camera being purchased from unauthorized retailers. Apparently, buying from Amazon is not acceptable. This company simply does not stand behind its products, so I would suggest avoiding them no matter how good their product is.
Mark, here is a link on how to clean your camera, it took me less than 5 minutes and my picture is as good as new. http://www.youtube.com/watch?v=2Uvh5ws77CQ