I have aThinkware 770 with a Samsung 128Gb card and all the 'useless' extras turned off. It works faultlessly and is tucked behind and to the left of the rear view mirror. You hardly notice it. Important when Mr MOT man fails you for obstruction on the windscreen, like they did with my old tax disc being on the screen.
The only issue is the stop/start doesn't cut in very often as it records a lot on parking mode and I have the cut off voltage set at 12v. So I either need to do more miles to keep the battery topped up or buy a Cellink B (expensive).
Install an anypower tpower ups battery. solved my battery drain issue
http://blackvueshop.co.uk/product/a...-for-blackvue-car-cameras-and-other-dashcams/