I have the ATC2K and use it on my rides. It does a decent job for the $, IMO.
It's not so good with the sound, (very muffled) and there's no viewfinder, so you have to experiment with camera angles and such when mounted on helmet or handlebars. You have to sight along it using the lines that are molded into the top and sides of the camera case.
On the plus side, it's aerodynamic, inconspicuous and water resistant.
It will show license plate numbers if you are within, oh, a couple dozen or so feet from the car while moving, and not riding on a rough surface. Maybe a little farther away than that, I haven't used mine in a while.