I've had this camera in my other car since March and love it. The quality is pretty damn good, especially at night.
Compare that to the GoPro HeroHD V1, which is an exceptional camera IMO:
Since the Blackvue has loop recording, there is absolutely no point in running a larger memory card. Each clip is about 3 minutes long (unless there is an event), and you can program it to keep all even recordings regardless of how old they are. I have mine wired to an add-a-circuit in the fuse box of my other car. It lasts about a week in parking mode before fulling draining the battery. Here is mine installed:
There is a purple LED that glows when its in parking mode (you can program different colors), it confuses many people. I live in a somewhat small town, but you can turn the light off entirely if it gains too much attention.
I do find that the microphone is very sensitive though, as evidenced in the videos.
EDIT - YT videos dont auto-embed?