I Run Rexing cameras in my personal truck, all my shop trucks, my beater car, and my wifes car. They're reasonably priced, have pretty good video, and so far they've been very reliable. My biggest issue when I first started using dash cameras is they would die, i assume from the heat of baking on the windshield in the summer.
I will say also, just as important as the camera itself, is an extremely high quality memory card. I ran cheap cards for a while and it wasn't worth it, I'd be driving around thinking I was protected for months, only to randomly check the footage for something novel I might have seen to show somebody and found the card hasn't recorded anything in 3 months, or is completely corrupt.
Whatever camera you get, make sure you pick out an extremely well reviewed high performance Memory card to minimize your risk of being SOL in a situation where you really needed the footage. It's definitely worth the extra $15 for a quality card vs taking a gamble and possibly being labeled at fault for an insurance claim cause your camera didn't work and the other guy had a more convincing story.