Old post but thought I would respond. We had 3 azdome 550s. The magnetic base was the feature we liked most. Bought extra windscreen mount bases so we could swap cams from car to car.
Many of the bases died.
All effectively dead now. Buttons don't work. One of them the micro sd slot crapped out and shot the sd card out never to be seen again. Disappointed as they weren't too bad to start with.
Viofo bought around the same time still going well.