i really like the BlackVue. it took almost a month to ship to me from Korea, but worth the wait and price. I have it wired to the power magic pro controller so it can run in parking mode, I leave it on all the time. it takes great quality video and the built in GPS/speed tracking is nice too. The HD quality is nice because you can read licence plates on the videos easily from 15-20 feet away. with a 32gb card i usually have a few days worth of video on the camera. it's pretty much a set it and forget it camera. I take the memory card out maybe every other month to format it and check for updates, etc.
if you've considered one I'd highly recommend it!