TexasCHLforum.com

Yes, I too ordered a $20 dash cam from Amazon over a year ago. 1080p, all the bells & whistles and swivels on the suction cup mount. Previously I'd bought a $14 model. It was ok, but difficult to operate and not near the video quality. I surmise that $20-30 is the quality point. Anything cheaper is gonna be temporary. When a particularly bad driver makes a bonehead move, I post that video on a Facebook page I made just for that, with the idea being you don't want a starring role on that page.
For $20, you can afford to mount front and rear and even a side view. The thing I notice about these cheap cams is the internal battery is gonna be cheap Chinese quality. It will barely last for the shut down after killing the vehicle ignition. Not a problem, but it's easy enough to replace the battery with something of quality. Or do what I did and plug it into an external usb cellphone battery that is also connected to the vehicle's 12v accessory. It's powered on 24/7, even when parked.