No, I haven't experienced this problem, but I have the large backup monitor in the center of the dash (combined with the Nav system and the audio system), so that may explain some of the difference.
In fact, one of the things that immediately impressed me was that the system apparently has the ability to amplify the available light coming into the camera at night. When I put the car in reverse, even in extremely dark conditions, I can clearly see at least 50 feet behind the car.
As to a problem when it is raining, I suggest that you try wiping off the camera lens before you get into the car. When there are rain drops on the lens, they act almost like a prism, and can cause distortion in some parts of the image.
In fact, one of the things that immediately impressed me was that the system apparently has the ability to amplify the available light coming into the camera at night. When I put the car in reverse, even in extremely dark conditions, I can clearly see at least 50 feet behind the car.
As to a problem when it is raining, I suggest that you try wiping off the camera lens before you get into the car. When there are rain drops on the lens, they act almost like a prism, and can cause distortion in some parts of the image.