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Yes, they are fine at night if the camera doesn't "open up" too much. In fact, the lack of blinding glare from headlights behind you is a big advantage. They have infrared LED's that light things within 15' or so; without having any visible light.
I actually have the same camera (more or less); the better and the worse ones are ostensibly the same. The one that is too white at night (because it's 'F-stop' circuit lets in too much light?) also has some green lines superimposed on the image (to try and assist with depth perception); but I don't think that is the cause for the problem.
All the cameras are challenged at the other end of the light strength: when in direct sunshine, they get overwhelmed -- the 'F-stop' stepping needs to be able to work in direct sunshine. Also, the screens I have get darker as they heat up -- they produce a fair amount of heat from the backlight and so in bright sunshine, they are not easy to use.
The video mirrors are best in situations when optical mirrors are weakest: at dusk and in the rain.
So, the bottom line is, I still use a small optical mirror on the driver's side, for when the car isn't running (like when I have parked in a parallel space, and need to see traffic to open the door), or when the screen is hard to see because it is in direct sunshine and/or the camera is washing out the image.
I've been running these video mirrors for over 2 years now, and they work, but I certainly see the need for various improvements. Another one that I have not mentioned in this post is the need to optically correct for the barrel distortion that these very wide angle cameras have.
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