I have three of these exact dash cams. Two of which I bought off of Woot a while back towards the beginning of the summer. One for my daily work car, and one for the wife's car. I had a close call in my truck (which did not have a dash cam at the time) in which someone flew past me in the center median, then slammed/locked up their brakes in front of me, assuming to try to get me to hit them for an insurance check. I was able to swerve and miss them, but unfortunately the car behind me hit them instead. If that were me that hit them, it would have been hard proving their fault in a rear end collision just on my word vs. theirs (which is what they were going for). If I had a cam in there, it would have been a lot easier to prove their fault had I hit them. After that, I bought two more of these, one for my truck, so now I have one in all of my vehicles, and gave one to my kid sister as a gift for her car.
So far I haven't had an issue with any of them, in both the heat of a sealed up car in the hot summer, to sub zero temps now in the winter. I put a 128GB card in my work car I drive everyday, it accepted the card, and hasn't had any issues. From someone who has purchased and uses several of these, I would say they are good deal and you should be happy with them Haven't had any issued with them locking up or not recording. I know some people have said they have had SD card issues with some, but of the four I have purchased, they have all worked fine.