I haven't, because I presumed they ran off the cigarette lighter socket. I'm not thinking of recording 24/7, just that I'd like it to continue recording whilst I am parked when visiting places. I presume you mean KB and MB, which are 8 times larger than the values you quote.
If I got one I would want it to continuously record even after I've parked up. I have a 64GB micro SD card, so how many hours of action (or otherwise:)) would that record?
Does that mean it stops recording the instance it detects a collision or very hard braking? If so, doesn't this mean that recording ceases just before any consequential road rage incident starts?